Yes, the adapters would never fit under rear fenders of a Classic CMC. I assumed you sold them with the 14" wheels.
5x130 drilled rotor/drums are not expensive though. Folks often convert the front to disc so there is opportunity there. Rear drums can be redrilled or replaced ($120 each new). The CIP1 Fake Fuchs with 5" backset are $145 or $161 polished. So all in for $1k.