Based on the photo I'd say the car is running a 255-265 30 series tire.
As for offset my fronts are about the same specs but it's no wonder my rears are off if they went -26 on an 11. That retracts just over an inch from my 12" -25et. Which is about what I am estimating for a good fit.
I think the -20 fronts would work with a narrower tire especially with 2.5-3* No way the rears would work without something super extreme.
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