Did a quick search and didn't find any answers...
2015 Audi A3 Prestige Plus with 18" rims.
Are the bolts conical or spherical? The rims I want to buy from ECS state they require ball seat, which I assume means spherical.....
Can't I just reuse the existing lug bolts?

Thanks ahead of time.....

 

I just saw that Autocorrect changed it from "Conical" to "Comical"....Sorry about that :-)

 

Solid rule of thumb is to purchase what is recommended by the manufacturer. If your not sure, call company your buying wheels from (ECS - 330.331.2003) You can also call your local Audi dealer's Service dept, and they should be able to give you reliable information as well.

Check out this vid, will be a quick watch to explain what you're asking.

Hope this was helpful.