Tascam 38 22-2 22-4 and others guide roller cover ring
These rings were more for cosmetic reasons and were used on many of the Tascam tape recorders
I was asked a few times about these so have put a few here, they may have a slight mark on the bottom where they have to be lifted off but the mark normally sits in the recessed section, its an odd spare but seems people get theirs scratched etc