This is our Original, RCJS engine conversion plate. It will allow you to easily install a Kawasaki 650, 750, or 800 engine, into a JS 440, JS550, or 550sx hull. BEST aligning plate on the market. NO hardware included. Our plate is designed to use your stock hardware. You will use the K650 or K750 bed pan to engine bolts to mount the plate to the engine, and 550 engine pan bolts to mount the 550 engine pan to the adapter plate. Please email with any questions before ordering, Thank you Part number # 550-CONV