your wrx twheel offsets

Where can i find the stock offsets for wheels of different years and models of Subaru (wrx, sti, wagon,...).

Im looking for summer wheels 17" for my SAABie
most likely running 215s. Nothing fancy just light and silver or gunmetal.

 

I've got 17x7 Prodrives with a +53mm offset and with 225s they sit perfectly flush with the fenders. I think the tires will rub in the back if I lower the car and dont roll the fenders.

 

Here's a good link: http://forums.nasioc.com/forums/showthread.php?t=335263