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use the OEM part number447-14451-01-00 if you want original or reproductions
Just cut and paste that number to google it
If you can find some original filters that the foam is shot you can get Uni Filter foam filter material to replace the rotted foam for them or use this catalog page to get the OEM number for other parts in the future https://www.partzilla.com/catalog/yamaha/motorcycle/1975/xs650b/intake-tx650a-xs650b
I doubt you could find part # 21 from that parts fiche though if that's what you were looking for
Some of them are just plain outrageously priced
If you can get old rebuildable ones on your side of the pond would be best
Keep looking there out there
Edit here's another website to get the OEM numbers from the diagrams are of a better quality https://www.yamahapartshouse.com/oemparts/l/yam/50041934f8700209bc78533b/1975-xs650b-parts
Congrats on the 75 there nice looking bikes
Post some pictures when you can and welcome aboard you've come to the right palce