Lug bolt shoulder angle
 

Wow... A couple of threads from me tonight. Anyone know the shoulder angle on our stock bolts? I had to step down to shorter ones with my new wheels after removing the spacers being used on the turbo twists. I picked up some with 60degree shoulders thinking they were correct. But after tightening them I see a distinct ring on the shoulder which makes me think the shoulder angle is less than 60 degrees on porsche wheels.

Not sure about the seat angle but if you go to McGard's website it will probablly tell you.

The Porsche lugs/seats I've seen have a spherical surface - not conical.
I believe they are R14 x 1.5?? I guess just search for Porsche specific lug nuts.

There ya go. Spherical bolts! Only porsche. Thanks guys.