The jackshaft bearing/motor mount from a 600 mtn cat will work. The other engine brackets from an 01 or 02 Mtn Cat 1000 should get you going. The bulkhead and chassis are the same whether it is a twin or triple, the plastic is different. The pipes could be a problem under the twin plastic. I have a 1500 triple in a King Cat chassis but had to use Thundercat hood and belly pan in order to get pipes crammed under the hood.