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They should have single jets at your local dealer. If you know what size(s) you need, call and see if they have them. Should be around 3-4 dollars per jet. Cheaper than a kit if you know what you need.
my chapparal racing catalog has jets in it for sale for about $3 a piece/ you can go to chaparral-racing.com and order their 800 page catalog full of model specific parts!