TACO Marine Grand Slam 300 Universal Backing Plate Pair, For GS-300 & GS-390, 6.50 x 5 x 0.25 in, Brite Dip Anodized

Overview

The TACO Marine BP-0300BSY-1 is a Grand Slam 300 universal backing plate pair for GS-300 and GS-390 outrigger mounts installed through a T-top. Each plate measures 6.50 inches by 5 inches by 0.25 inches and uses a Brite Dip anodized finish, giving the outrigger base a clean finished look while adding support at the mounting point.

This backing plate is used under the T-top where the outrigger mount passes through, helping spread load around the base rather than leaving the fasteners working against a smaller area. Directional markers every 22.5 degrees line up with the locking detents of the compatible Grand Slam mounts, so the pole position can be checked at the base during setup and use.

Key features

• Made for TACO Marine Grand Slam GS-300 and GS-390 outrigger mount installations through a T-top.
• Pair of backing plates for port and starboard outrigger bases.
• Each plate measures 6.50 inches by 5 inches by 0.25 inches for fit planning around the mounting area.
• Brite Dip anodized finish gives the installation a clean appearance on visible T-top surfaces.
• Directional markings at 22.5 degree intervals align with the locking detents on compatible outrigger mounts.
• Matches the existing base hole pattern for compatible Grand Slam 300 and 390 installations, helping avoid unnecessary drilling when the setup is already laid out for these mounts.

Installation and fit

This plate is intended for through-T-top outrigger base installations where the GS-300 or GS-390 mount needs backing support and clear orientation reference. Before installation, confirm the available flat mounting area, hole pattern, fastener access, and clearance around wiring, pipework, canvas, or electronics mounted near the T-top frame.

The 0.25 inch plate thickness should be considered when checking fastener length and stack-up through the T-top. Final mounting should follow the outrigger mount installation requirements for the boat, with attention to sealing all penetrations and keeping the base properly aligned before tightening hardware.

Use on board

This backing plate is a good match for offshore and coastal fishing boats using Grand Slam outrigger mounts where the crew wants a cleaner T-top installation and an easier way to read outrigger angle at the base. The directional markings are useful when deploying, rotating, and stowing outriggers because the pole position can be checked without guessing from below.

What’s included

• One pair of Grand Slam 300 universal backing plates

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Returns may be requested within 30 days of receiving your order. Items must be unused, uninstalled, unaltered, and returned in their original packaging with all tags, packing materials, blank warranty cards, manuals, instructions, accessories, and included items. Certain products, including installed or used electronics, electrical components, lighting, consumables, custom or special-order items, cut-to-length products, safety equipment, and merchandise exposed to water or marine conditions, may not be eligible for return.

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Customers are responsible for arranging and paying for return shipping unless the return is due to an error by Apollo Lighting or the item is verified as defective, damaged, or incorrect. Missing, damaged, defective, or incorrect items must be reported within 2 business days of delivery, and photos or other documentation may be required for review. If the issue is verified, Apollo Lighting may provide or reimburse return shipping and issue a replacement or refund depending on the circumstances. International customers are responsible for return shipping, duties, taxes, customs charges, brokerage fees, and other costs associated with an international return.

After your return is received and inspected, approved refunds are issued to the original payment method and may take 5-7 business days to appear after processing. Original shipping and handling charges are nonrefundable, and the value of any included free items that are not returned may be deducted from the refund. Apollo Lighting does not charge a standard restocking fee on eligible returns. Returns that are incomplete, damaged, installed, used, altered, improperly packaged, or otherwise do not meet the eligibility requirements may be refused. We recommend using a trackable and appropriately insured shipping service for all customer-arranged returns.

For assistance, contact info@apollolighting.com or call +1 (954) 375-0100.

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Many products sold by Apollo Lighting include a manufacturer's warranty covering defects in materials or workmanship. Warranty terms vary by brand, product category, and model, so eligibility, coverage duration, exclusions, and available remedies are determined by the applicable manufacturer. We recommend reviewing the warranty information provided with your product before installation or use, especially for marine electronics, navigation equipment, lighting, electrical systems, pumps, safety equipment, and other specialized marine products.

If you need warranty service, the claim must follow the process established by the manufacturer, authorized service center, or designated warranty provider. You may be asked for proof of purchase, a serial number, product registration, photos, maintenance or installation records, or other documentation. Apollo Lighting does not determine or modify a manufacturer's warranty coverage or final claim decision, but we are happy to help provide purchase information and direct you to the appropriate manufacturer or warranty resource.

Keep your receipt, product documentation, serial number information, and original packaging when practical. Damage caused by normal wear, misuse, improper installation, insufficient maintenance, corrosion, impact, unauthorized modifications, electrical issues, or operation outside the manufacturer's specifications may not be covered. Warranty claims are separate from standard returns, so a product that has been installed, used, or exposed to marine conditions may no longer qualify for return while still remaining eligible for evaluation under the manufacturer's applicable warranty.

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