myfenix.co.uk sell them. Another option would be to get some Sugru and mold your own.
Those are for the TK10, TK11, TK12, TK15 or TK21 and NOT for the TK22.
Given that the grip rings used on the TK21 and 22 are almost identical, it seems likely that the same smooth ring will fit. I own a TK21 and a 22 and switched the grips over and saw no discernible difference. The threads are the same.
Have that ring for my TK11, it also fits the TK21. So I say 99% chance it fitsDoes any body know if the ring from fenix-store could be used on TK22?
http://www.fenix-store.com/product_info.php?cPath=25&products_id=528
Thanks~