Dial in fitment on your rig with the Atlas Jack Plate Spacer Kit, a jack plate accessory that helps anglers make the right back-plate adjustment when pairing an Atlas setup with a Yamaha 4.2 Liter 250 or 300 HP outboard. This kit matches T-H Marine Atlas Jack Plates and addresses specific engine bracket changes with a durable 6061 alloy aluminum build that holds up to hard use on bass boats, bay boats, and other high-performance fishing rigs. It fits back-plate applications only and comes in polished aluminum or anodized black, giving boaters a clean way to match their setup while keeping the jack plate properly configured for real-world on-water performance. Made specifically for T-H Marine Atlas Jack Plates Compatible with Yamaha 4.2 Liter 250 and 300 HP outboard motors 6061 alloy aluminum construction handles long-term marine use For back plate use only and available in polished aluminum or anodized black finishes Manufacturer's one-year limited warranty Made in the USA