My old ones were 7x15 and the new ones are 7x15 but they different offset. The old ones were about 30/32 offset , the new ones are 38 offset but i am going to space them by about 5mm to help give a bit more clearence from the coilover conversion. I think Pukka once had something like 8.5x15( just a guess) with zero offset but he had arch conversions.
Tyre size on standard rims , i have run 205/60/15 before and thats what i have on the new ones aswell
The company i dealt with said one of there guys was running on Rota Rb's which were 8x15 but he had to use195/50/15 to get them to fit????? would have to see it to see if i liked it .