I'm rebuilding my 91 CBR600F2 and needed to buy four intake boots/manifold things. The official Honda designation is a "carburator insulator", but they are really just little rubber intake manifolds that lead from the carb to the head. At any rate, I got four of em off eBay for a good price. The ones I got were off of a '94 F2, and I just got em today. They look a little different than the ones that came off my bike, but it looks mostly cosmetic. The big issue I have though is that while they fit snugly on the cylinder head side, they are pretty loose on the carb side. They have metal clamps for both sides, but if the rubber isn't snug on the carb side, won't it still leak air even if I tighten em up real good? Anyhow, do any of you gurus know if the part for the 94 is interchangeable with the ones for the '91, or do I need to get new ones. I could probably get three of the old ones to work, but one of em got totally destroyed taking it off the bike. Rubber is torn and useless. Thanks for the help folks!