Here is a good selection of S&S carb jets of all sizes . I got this in a parts deal from a service shop . I don't know too much about them but I believe they were just used for tuning bikes . The shop owner had passed to I have no other information . I am sure who ever buys them will be getting a good deal as I know to buy them new is pricey .Thanks for looking and please see my other listings Robs Used Harley Parts . Enjoy the FREE shipping !