We have run an 19x8 on the front with a 4.75" backspace, and a 20x10 on the rear with a 5.5" backspace with a 245/35/19 and 285/35/20 rear and it worked well.
The problem with ordering a 20x9.5 is it is not a softlip outer rim, but a standard rim size, so you don't get the nice smooth lip on the front side of the wheel. If that is what you want, then go for it in the 9.5, but if you want "softlip" then it will have to be a 10". This is assuming you are looking at two piece billet wheels like Rushforth Wheels, Budnik, or something similiar.
What wheels are you looking at?
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Brian Hobaugh SCCA National Tour June 2014
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