Clear float bowl plugs
I think some folks are confused about the old plastic sight level plugs, which were supposed to be temporary, and the new permanent glass inserts that are used.
Lots of new carburetors come with glass inserts now. The Holley Ultra double pumpers like the one I have on my Duster (0-76750BK) do, the manual clearly advises they NOT be removed.
Mines been on the car about 8 years now, no issues with the sight glasses.