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Searched forever for this, and nothing but typical snide remarks. Hope this helps someone.
Must replace seat bolts when replacing seats in car, part number 07 14 7 146 686. Apparently bolts are coated for ?corrosion protection and safety.
See this link:
http://tis.spaghetticoder.org/s/view.pl?1/08/07/70
Seat bolt torque is 35Nm.
***"Carpet must not get between seat rails and floor pan in area of fastening points (grating noises). "
Hope this helps someone else.