I was buying the rubber bumpers from a local car wash supplier, but they were getting expensive, while the rubber quality was going down. I couldn't find the same ones from Kleen-Rite. I did some research and found an unlikely alternative... rubber feet for stereo speaker cabinets on eBay! They're made of solid rubber, with an internal metal washer for better rigidity! Quick search this morning and you can buy 8 for $15.Slightly off topic but, Kimberly, I see you have the same booms that I do. I don't know the manufacturer. I need to replace several "round bumpers" on the end of the boom. Do you know the item, and where to source?