You can identify the calipers by looking at them.
It is all to do with the cooling fins & the front face
322mm
BF 322mm caliper
28mm thick disc
329mm - AU Premiums - Also C4 corvette caliper
Distinction is in the round mounting holes in the face of the caliper
28mm thick disc
325mm - BA Premiums - C5 Corvette caliper
Flat face, cooling fins at top only, central divot
32mm thick disc