Where can i get a jet kit for my 1978 Honda cb750k?

I have a cb750k that i would like to get jetted but i cant find any jet kits for it. I have full flowing exhaust and pod filters on it. Ive tried bike bandit, eBay, and a bunch of other websites and no luck. They make jet kits for this bike for 1969 to 1976 but not the 77 and 78. Any info would be greatly appreciated|||Try chapparral bike parts also 77 78 i believe uses the same kit as a 900