There are different kits for different years- I just ordered KH-0899 for my '77 CB550k3, $42.50 each X 4 and the slow jets at $22 for the set & $5 for airmail, total $197.00- got them in one week from Sirius. Not cheap but they were the only place that had complete kits specifically for my bike, I'm tired of trying to clean them & messing with the air box is a major pain in the ass- so I'm hoping to do it one more time & be done with it.