I got mine from ebay and it was fine. While the set I picked up had been rebuilt already I was chasing a lean issue I thought was caused by a dirty zenith. Here is the set I bought:
https://www.ebay.com/itm/173463111795?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=F1CkhQYeREi&sssrc=2349624&ssuid=DUS7LoxvRf6&var=&widget_ver=artemis&media=COPY
Everything in the kit was good. None of the kits come with a particular sized o ring that fits on the mixture screws. I bought a bunch and can send you 6. Check out my trials over on 914world.