This kit allows you to bolt a Kawaski 750sx type pump in a JS 440, 550, or 550sx hull. For early "JS" type hulls (Up to 1990) you will need to convert to a RHAAS drive bearing part number 550BEARING which we also have on our site here. You will then need an X-2 drive shaft which we have new here too. Please email with questions before ordering, thank you.