Caliper piston size in 97 L

[loganmossmusic]

I believe my brakes need a rebuild and I dont know for sure which size rebuild kit to get from autozone, the people at the store near me claim they dont carry it, but here it is on the internet anyway.
http://www.autozone.com/autozone/parts/ ... ing=search (http://www.autozone.com/autozone/parts/1997-Subaru-Legacy/Brake-Caliper-Kit-Front/_/N-j9fnrZ8kn5i?filterByKeyWord=caliper&fromString=search)

I have 14" wheels and single piston calipers so do I need two of the 57mm kits or 1 of the 43mm kits? Also any experiences people have with brake rebuilds and the effectiveness on the feel and function of the brakes would be appreciated.

[Huffer]

I wouldn't bother with a rebuild kit. I prefer to get a semi-loaded caliper and just do a core exchange. It's much safer and easier that way and you get a warranty.