Ok so while I was putting in the forester sway bar mounts, I confirmed that the forester rear sway is in fact bigger and by significant amount.

 

I took the bushings that were still attached to the fozzy pieces and had still gripped the fozzy bar well at the yard, and I put them on my imp bar where its stock bushings mount and there was a lot of play... I'm thinking the fozzy bar has to be better than an 1/8th of an inch bigger, so for people doing the swap im doing or similar if your handling sucks afterward, you should try a fozzy bar! I think next time I'm at the junkyard I'm going to snag that sway bar and see if it will fit on my car, and then try and fab up some sort of quick release mounting so i can disconnect it when on the prowl

 

Anyway just an FYI, was thinking this info could be added to the lifting FAQ. I'll report back on this more when I find out about fitment.

I knida think it won't fit. I do believe that a WRX front sway will fit your car, the rear ones swap, assuming it's an impreza.