Reddit mentions of IBM Selectric 71 Typewriter Ribbon Compatible

Would something like this be what you're looking for? https://www.aroundtheoffice.com/Typewriter-Ribbon-IBM-Selectric-1136076/productinfo/SC-062-IBM-COM/ I have Around the Office Ribbons in three of my manual machines and they seem to work pretty good.

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Wait I think I found it! https://smile.amazon.com/IBM-Selectric-Typewriter-Ribbon-Compatible/dp/B001D4F9E4/ref=sr_1_6?keywords=ibm+selectric+typewriter+ribbon&qid=1554498085&s=gateway&sr=8-6 I had to do a few searches to find out what the ribbon looked like. The Fact says its the film not a cloth ribbon.

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The coronamatic 17657 is the Black Nylon ribbon and is either still in production or of very recent manufacturer. Amazon listing with correct picture is here: https://www.amazon.com/Smith-Corona-17657-Ribbon-Typewriters/dp/B00006RVRZ/ref=pd_sim_236_2?ie=UTF8&dpID=41ASCQE7TJL&dpSrc=sims&preST=_AC_UL160_SR160%2C160_&psc=1&refRID=J2MJF5KB6JBTRMJ395V2 (This is the one I have for mine)

Selectrics, with the exception of the the Model 72 (Selectric I Fabric ribbon) only have third party film ribbons available new, the Model 72 which used the fabric ribbon cartridge has nylon ribbons available for it.

Amazon Examples (none are actual IBM, but third party):

Model 71 (film spools): https://www.amazon.com/IBM-Selectric-Typewriter-Ribbon-Compatible/dp/B001D4F9E4/ref=sr_1_12?ie=UTF8&qid=1467922700&sr=8-12&keywords=selectric+ribbon

Model 72 (Fabric Cartridge): https://www.amazon.com/Typewriter-Ribbon-Selectric-General-Fabric/dp/B000HRXI1E/ref=sr_1_18?ie=UTF8&qid=1467922700&sr=8-18-spons&keywords=selectric+ribbon&psc=1

Selectric II: https://www.amazon.com/Nukote-Nk86hy-Selectric-Ribbon-Cartridges/dp/B00TRUOBHM/ref=sr_1_5?ie=UTF8&qid=1467922700&sr=8-5&keywords=selectric+ribbon

Selectric III: https://www.amazon.com/Typewriter-Ribbon-Selectric-Compatible-typewriter/dp/B007JNYNVI/ref=sr_1_3?ie=UTF8&qid=1467922700&sr=8-3&keywords=selectric+ribbon