For mine I bought a rebuild kit from Kraft Power in Ohio. They were very easy to deal with and quick on sending parts out. 4039 Millennium Blvd.,
SE Massillon, OH 44646-9606 (T) 330.830.4158 (F) 330.830.5175
The kit was fairly easy to put in as long as you have a press. I don't remeber if they would rebuild them for you if you sent your pump in.