Reviving again.... This thread helped get me started, but FWIW, after two trips to the hardware store, I'll share my experience in case it helps anyone prevent that second trip.
My car... new-to-me B7 - '08 A4 Avant 3.2.
Rear license plate bolts: M6-1.0x12mm
Front license plate bolts: M4-.7x12mm
I used socket cap bolts. So you can have your wrenches ready, the M6 (rear) screws will take a 5mm wrench. The M4 (front) ones require a 3mm wrench.
Small bummer for me. My hardware store carried black zinc plated bolts, but not matching washers. The frame & plate mounting holes were fine for the M6 screw heads, but were too big for the M4 ones. Worse, the 'matching' M4 washers were also too small. So, I've got some ugly 1/4" SS washers against my black plate frame up front. Sigh. In any case, 12mm-length screws were long for both, and I now have extra 16mm bolts that I'm too lazy to return. All said, even with the extra bolts and washers, total cost was just over $6.
Pics...
Rear:
Front:
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