To be honest, I don't know the backspacing. I believe they are f-body specific, but I can see if a call to Fikse with the serial numbers on the faces can help. I'll post up when I learn more.
The tires are 275/40R17 up front and 315/35R17 out back. Paid $716 for them back in 6/2011 and the car has seen less than 10k miles on these tires. No track days but one autocross.
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