I had a set of group 4 wheels on my Pantera and here are their measurements: front 10x15, backspacing of 4 5/8 inch and negative offset of 3/4 inch; rear 14x15, backspacing of 5 1/2 inch and negative offset of 2 1/32 inch. Hope this helps! Note: my wheels are now in Belgium, I did not feel like driving on the track with 35 year old rims at 185 mph!
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