Not sure about the 22's but I believe that in addition to the self tailing parts
which go on top of the drum, the drum itself is different and probably the main center frame where the self tailing
mechanism engages the frame so that it does not turn with the drum. You will be better off finding some used Barient 22 self-tailer's complete. I bought a pair of 28's for $500 each.
Sailing is a sport, an athletic activity, not a sedentary one.
Fred Roswold-Fred & Judy, SV Wings, Mexico