275/60/15 et street pros on a 71 Duster.

I bought a set of 275 /60/15 for my 71 Duster because they’re on sale but I don’t have rims yet. My car has the springs in the stock location and I’m slightly worried about them fitting. We’ve run 275/60/15 Cooper Cobras on a 73 Duster w 15x8 with 4.5bs and the were tight but they fit. Those tires list as a 10.7 section width while the ET Street pro lists as 11.4 section width. I’m just curious if anyone has run the Pros with stock location rear suspension, and what
wheel combo they used.