"The calipers of both cars are essentially the same"

Great. Thxs Frank.
It's the extreme event of having calipers that are scrap that concerns me. This takes the pressure off.

You wouldn't believe the bureaucratic hassle involved in ressurecting a car when the annual inspection has expired!!

Thxs for taking the trouble to respond guys. Much obliged. I hope this purchase works out as I am looking at a w115 with totally rust free sills, chassis rails, floor, and....bulkhead!!. Amazing.