ok, on the 9.5 front go with 255/35/20 (27" diameter)
on 11 inch rear (or 10.5 if you can) go with 295/30/20 (27" diameter)
these are the optimum sizes to stay close to stock diameter. you might be able to go with 265/35 and 305/30, but your diameter is going to be 2% off of stock, which may cause issues with TCS, I'm not sure what the threshold is with the 370 yet.\
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