VW used the same rear studs for both steel and alloy. The shape of the
nuts changed with the thicker alloys. The factory alloy setup only
engages about 7 threads on the rear with the matching nuts. If you added
10mm of thread that would almost double the factory thread engagement.

Mark

Ralph Meyermann wrote:
> My westy originally came with steel wheels. The 14" VW alloys I needed
> longer bolts for the front and not enough threads on the rear for me to be
> comfortable. Thinking another 10mm of stud length would be fine. Have yet
> to size up wheel on the rear yet, the wheels came with new bolts and nuts.
>