Wheel BOLT ONLY Question

[SuffolkD at aol.com]

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Yes, there is a twist to my question:
.....and yes its 20V content too.

My old 15"alloys for my 4KQ came with longer bolts.
My mechanic said the factory bolts held by two threads or so.
Transition to the 20V:
So I have these A4 17" knockoff wheels from Discount Tire, and I want to fit
them to the Avant.
Should I look into longer bolts than OEM?
-Scott in BOSTON