Just for reference the following site has ribbons for the subject card
punches.

https://www.aroundtheoffice.com/IBM-026-Keypunch-Ribbon/productinfo/RP-520-I
BM/

I bought some a few years ago.  As I understand it he makes a batch every
year or so.  I don't know but he might like the used reels back to use
again. :-)

Donald

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