I just got a set of A6 Hoosiers from a forum member who campaigned in SCCA DS class. The set up is 285 18 on the front using 5mm spacer. I found a very slight rub under heaving cornering so will be using 6mm this season. Backs are 255 19s with 10(?) mm spacer from HR. I could give you more details if needed. Currently I run this in local club and also in DS class. Big front tires really helps in autocross.

PM me if you need anything.