To my knowledge id say they off a a4 2.0 tfsi dont quote me thou, but I know for definite the 973 on the rear of the caliper means its left side if it were 974 it would be right side.
If it is for a 2.0tfsi then it would be a 320mm disc needed.
The other way to tell is to look for a code like 11.8012-
something on those lines. Might be able to assist further.
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