You can go to the hardware store like stated above in a pinch. You best bet would be like Jerry said Napa or other autoparts store. Get a Summit catolog they will list them and you could buy from there also. The hardware store will carry them BUT the internal openings will be small which could restrict your fuel to engine at wide open throttle. It will cause all kinds of trouble when this happens . You can raise pressure , adjust jets, and replace fuel filters with bigger ones and it wont help. If the fuel cant get through the fittings at WOT, it just cant.