290Used carburetors from a 1998 Sea Doo Speedster with twin 787/800 engines. These carbs are for parts only. Insides have some rust, including screw heads being rusted down. Because of that these are likely not a rebuild candidate. These will yield some usable parts, but there are no guarantees as to what is usable and what is not. These carbs are specific to certain jet boats including the 1998 Speedster 787 and 1998 Challenger 1800 with twin 787s.  Includes all shown. 
I can only guarantee it fits the year and model listed above. Please check with your local dealer, or an online microfiche (Seadoo Microfiche) to see if this part will work for you!
Be sure to ask questions before bidding...I'm happy to provide more pics if necessary. 
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