We often get requests for the lids for Revere Ware mixing bowls; apparently the original lids tend to fail after a while. We did fine a crowdfunding campaign for some universal lids some time back, but a simpler solution may just be already available stretchy silicone lids that are pretty inexpensive.
Here are the mixing bowls.
The sizes are 9.75″, 8.5″, 6.75″, and 5.25″.
Here is a set of stretch silicone lids:
According to the listing, here are the sizes that they will fit:
❶ Special XL size 9.5” to14”
❷ 7.9” to 11”
❸ 6.5” to 9”
❹ 5.9” to 8”
❺ 4.7” to 6”
❻ 3.7” to 5”
❼ 2.8” to 4”
For 15 bucks, I think it is worth a shot.
Great suggestion about lids. I see your 8.5″ bowl is not an O-ring handle, but a newer D-ring. I have the same problem with my mixing bowl collection, with the same bowl size missing. I thought it didnt exist until i saw it on ebay.