i wonder if you might clarify something for me.
as we have now managed to get the 285/50R15 Pirelli P7 made again which were OE on the 79-84 cars, i'm wondering what else they will fit?
The 285/50R15 P7 can fit on a 8"-10" rim and the 225/50R15 P7 can do 6" - 8"
In my mind your earlier cars can still get 185/70VR15 XWX and 215/70VR15 XWX, so why mess with those. You have the perfect option. But then the 1972 - 1978 cars are in a bit of a tangle, There isnt really the perfect tyres out there. However they have 7" rims front and 8" rims (maybe 10") on the back. In my mind this slightly later P7 set up also fits on these rims, but does it fit in the body?
I have built this web page
and i am also doing this one about tyre pressures
If you have any data that will help make these pages as accurate as possible please post it on here.