Hullo-- Tried Oreo's prying technique and pulled out a second chunk of metal from the lip of the piston
Oh well. did locate a nearby boneyard (sort-of) and grabbed a 108 caliper. Took lots of cleaning and finagling with it to get it to act right, but, REJOICE, caliper is in place and appears to work!!
NOW, issue is, howinahell to replace rubber front brake hoses. Tried soaking them in PB Blaster - heat - pressure - cussing - what now??
Thanx all, you're collective lifesavers...
kpb