They are 1984-1985 Kawasaki KX 500 reed cages. OEM part numbers:
VALVE-ASSY-REED 12021-1051 Gasket,REED VALVE 11009-1360 BOYESEN POWER REEDS 626.
This should aid your search.
You didn't mention it in your original post, but you have to change the gaskets in the exhaust when you run a half pipe set-up.
https://www.watcon.com/1-2-pipe-gasket-kit
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