Delivered FR5 package has a different suffix and a stepped mounting plate where our agreed fixture drawing shows a flat face. Seller answered equivalent without naming either difference. Tooling remains unfitted.
Ask them to identify what the suffix belongs to and compare the delivered plate with the approved drawing; one answer about the package label won't settle the mating face.
Technician says the suffix is a packing revision. The stepped plate is also a substitution, now acknowledged separately. No assembly comparison or original-plate supply answer yet.