You can find these for under $5 on ebay. I got one for about $4 and it looks like carbon fiber. (it’s not, though, it’s just plastic like these - exactly like these)
Grandma!!! I found your diaphragm!!!
The description says that this is a “clip-on” cage that goes on your handlebars.
The pictures show that this is a normal cage that attaches to the frame.