1970 DUSTER WITH DISC BRAKE CONVERSION WHEEL HELP

rear 15x8 with 4 1/2 backspace 275 60's fronts hit the fender 15x7 with 4 back space. The wheel was back a tad due to suspension movement from a eccentric bolt failure as seen in picture above. The tire never hit with with narrower wheels. Here are pictures of the of the car prior at the track then Leaving the first time with these wheels and when it returned.

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Did you have big bolt pattern disc conversion in this car? or ??
Thank you