1998 Rockshox SID Damper Cartridge: Black
This assembly replaces the internals on the right side (damping spring) of all vintage 26" SID forks from 1998. Contains the cartridge only, does not include hardware that slides onto either side of the rod.
It is well lubricated and smooth, but the plastic cap that's on one end is split. Maybe the one you're replacing is dry or bent but has a good cap you can swap!