Installing Kelsey Hayes Caliper Pistons ?

Hard to say what kind of corrosion they had sitting around for 16 years - maybe just some gunk holding them in the cylinder, but also our friend named Rusty may have paid a visit. If they look OK after you get them out and inspect them, then yes. I think you will have to look carefully in the seal grooves - any big pits in there would be a point where I would consider new ones.
ok thanks! Trying to decide on rebuilding these or get new ones..rebuilding will be close to 100 bucks, replacing will be 200..i have already spent over my budget on this, the only reason im hesitant on rebuilding them is failing at the rebuild, but at the same time, doesnt seem too bad of a job..whats the chances of screwing up the o-ring seals when installing the new pistons?