Thanks for your pointer. I used the part number from your Ebay link to do a google search and here is what I found:Is this what you are looking for? Ebay
As written I was looking for "port covers". I bought those 200 pcs on ebay. Now I have around 150 pcs left.Are you looking for the covers for the slots on a switch or the ones that come on the QSFP+ modules? ...