Amazon.com: Made in USA 2" Inch (50mm) Round Rubber Plugs For Holes, Flexible Black Rubber End Caps, Hardware Plugs, Metal Tubing Post Rubber Cover Protective End Caps For Furniture by Prescott Plastics :
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Rubber cover for KB-14 and PM-5 - Protects KB-14 & PM-5
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Amazon.com: Made in USA Prescott Plastics 2” (50.8 mm) Square Rubber Hole Plugs, Vinyl End Cap, Black Rubber Cover for Metal Tubing, Fences, Rubber Caps for Glide Protection from Chairs and Furniture (