Rebuilding kit (needed ?)

I have 4 piston calipers on my 68 fastback one side was rusted up I took it apart and it seems to be pretty freed up.I 'm looking for a place to get a rebuilding kit in case it leaks,unless it don't pay.thanks

The pistons on the 4 piston K-H calipers are availabel from several sources including Year One and share the same parts as the first generation Mustang.

NAPA, Rock Auto, O'Reillys and others had the seals and the pistons available just a few months ago when I checked. Not too expensive and fairly simple to repair.