Sure thing...also, sorry about the delay. Fronts are 9 ET45 and I run a 7mm (so ET38) spacer generally. Front fitments on GT3's are tough to compare though because it all depends on how many lower control arm shims you run, whether or not the strut tops are rotated, and how much camber you have. When I had a 265/35-18 up there, I ran the wheels without the spacer. I actually run the stock offset in the rear so that I can run multiple tire setups. It is a 12 ET63 and I run it as-is with the 335/30-18. My normal setup is with 305/35-18 Nitto NT-01's and I run 10mm spacers to yield an ET53.