A few months ago on E-Bay, someone was selling a seat post shim for a PK which supposedly gave a better fit of a 13/16 post in a PK/Race seat tube. Does anyone know where to get these things if possible. I have a correct post, but tightening the seat clamp down brings the slot in the seat post tube together, thereby limiting proper tightening. Were these shims OEM or something or a fix afterwards?.

Dans Comp has them or you can always use a coke can.