Front coil over spring cap

[Campbell]

I need a spring cap for a front coil over set up - Tokico race shock under a welded in camber plate. For some reason the inside ring of the cap (which fits inside the coil spring) is all chipped and chewed up. I believe it was a Carrera coil over set up. Is it possible to just buy the cap? does is have to be the same brand? is this something Ground Control can help with? thanks