The B3 typ89 FWD floorpan is different to the B4 8C, the front part is nearly the same but the differences in the rear are considerable. You would need to cut out large sections of the floorpan to replace them with Quattro bodyparts in order to accept the subframe and driveline. In order to cut development costs the B3 resembled the earlier types more than the B4 where the back part is closer related to the A4. And dont be fooled, as the B4 coupé and cabriolets secretly are B3’s typ89 and not B4 8C type.
