Fit B body pedals in A body.
The Op is referring to a set of pedals he has in a separate for sale ad.
The top part appears to be from a 66/7 B body but the pedal arms themselves are NOT B body.
It's a cobbled set and the part that is from a 66/7 B body is cut on the front so it's no longer of any use even for a 66/7 B body and its missing pieces.