Conversion question

I have js550s and 650sx I’ve come across a full working Polaris sl 750 triple motor out of a sit down and want to put in 650sx or js550 if have to but can’t find any info on this being done or who makes conversion plate or kits for doing so. Can this swap be done? Is there no kit cause bolts directly up to these skis as is? Please help any info on how to make this work or were to purchase kit to make this happen will be greatly apprecheated I’d love to ride it this season or within two weeks if can be done thank you all for input and help this site rocks
Ride as much as possible it’s good for you!
 
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