Jason and I discuss backspacing and sizing on his diect wheel orders all the time. Our tech service is for members, not for sales. Sales just happen to come. So your still welcome to call.
As for size, your going to spend cubic $$$ going up to 11" wide for very little gain and a lot of possible trouble. Were it me, I would do the 20 X 10 and 19 X 8.
Those isolators were on some cars from the factory, probably not yours. But they will riase it half inch using them.
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Frank Serafine
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