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Hi George, This is the only one I could find. https://www.brownells.com/shotgun-parts/magazine-tube-parts/magazine-tube-extensions/remington-870-blue-magazine-extension-3-rds-sku159000007-74822-46487.aspx?rrec=true

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Several options for different capacity are here : https://www.midwayusa.com/product/2171129984/choate-magazine-tube-extension-remington-870-1100-lightweight-20-gauge-blue ------ https://www.brownells.com/shotgun-parts/magazine-tube-parts/magazine-tube-extensions/remington-870-shotgun-magazine-extension-prod74822.aspx ----- https://www.walmart.com/ip/Remington-Model-870-20-Magazine-Extension-Kit-3-Rounds-Parkerized/24182927

here is one https://www.midwayusa.com/product/2171129984/choate-magazine-tube-extension-remington-870-1100-lightweight-20-gauge-blue