Ironically, I was just fixing up the bass-mounted cymbal stand on my 50's Kent kit last night...
Which kind are you looking for? My 50's Kent has a straight, vertical post that mounts on the top center and slides in and out of a holder that is identical to the spur holders. I have also seen the L-arm style of cymbal stands for Kent bass drums that mount on the side of the drum. If you are looking for the L-arm type, just about any older L-arm mount from Rogers, Slingerland, Ludwig, etc. will work and look about the same. I have never seen the vertical type for sale anywhere, even on Ebay.