are these the wheels you were on about?

7.5x13



i got mine from essex, seems to be the place where most old fords survive lol

the widest tyres you can fit on standard arches with these wheels are 205s

because of the offset the tyres sit right inline with standard arches so if you lower the car they rub like hell

with x-pack arches you can get away with pretty much anything up to a 240/50/13