I think the offset on the 06- 17's is +48 for some reason. would you mind if I tried on one of your forester wheels at the next B&BS meet?I'd say no.
LGT = 16" and probably a +53 offset
06 WRX = 17" and probably a +53 offset
If they fit, it would be DAMN close. I know a few Forester folks have put 06 4-pots on their Foresters and the clearance was about the width of a plastic cable tie. But I've also heard that the red 4-pots don't have raised "SUBARU" lettering which gives them a little more clearance than the old JDM black 4-pots (which didn't fit the Forester).