The 205/70x15 tyres have the same rolling diameter as the 6.00x16 original crossplies, but with much more grip and a smoother ride. The 70 profile tyres also come in 215 and 225 sizes. The wheels are 6J width (6 inches). No problem with arches clearance. I have a set of 8J Ronals that look like Minilites but I don't think they will fit without some mods or lock restrictions.
Hubs from the 410 onward use a larger Point Circle Diameter (PCD) similar to period Jaguars. BMW rims are fractionally smaller at 120 mm PCD but can be adapted.
When changing rims, take care that the taper profile of the nut matches the seat in the wheel. The wrong angle can reduce the contact area and lead to cracking.
Steel rims can be altered to hold the original hub caps and retain appearance.
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