Interesting... what sort of minx had 15's on it? All the 60's ones that have passed my way have had 13s or 14s on them & I thought the old bubble shape 50's minxes were some sort of weird 3-stud pattern?
Mid/late fifties to early sixties Minx (and associated cars) had fifteens. The later series cars had 13's. This was my '61 Rapier on its 15's
Dunno if it helps but some modern Peugeot steel rims (same PCD as Rootes) are pretty much just pressed steel with very little in the way of cut-outs, and look quite old-skool if you squint?!?!
I had thought about finding some newer steels to play with but I've got wheels now.....