1974 - 904 Transmission Reverse/Low Band - ???
The band in the first three pictures is the kickdown band, not the low/reverse band. I am rebuilding my '73 318 904 and my low/reverse band was fine and I thought most of the time they didn't even need replacing.
That cast kickdown band you have pictured though...keep that. They are getting scarce as I found out just now and the replacement flex bands are not near the quality. I think the factory cast kickdown bands have to be re-lined now.