This fits my Sony TC-YX7
Following a search, there was a different belt listed so I order that.
Didn't fit, called and spoke to a very friendly fellow. After a detailed conversation in which he actually confirmed measurements on this FBS8.4 they mailed a pair for me to try out. I can confirm that they work properly in my two Sony TC-YX7 cassette recorders.
Thanks folks, I'm back in business!
Reviewed by: Jerry from Bettendorf Iowa.