I think he's referring to one of these. I have the largest size, love it. *be sure to select the appropriate size from the drop down menu.Thanks, can you tell me where on eBay I can find them?
https://www.amazon.com/gp/product/B08S32V75P/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1&psc=1