don't have any 21mm spares, but just checked and seen that the newest GG-reseller, German skysmoker still has some (few, one?) left:
TILEMAHOS V2 / V2PLUS / X1 SS BODY SHINED 21MM WITH ENGRAVINGS
good luck!
TILEMAHOS V2 / V2PLUS / X1 SS BODY SHINED 21MM WITH ENGRAVINGS
good luck!