Here is what I have been able to identify as far as M&S/Wayne 80 tops.
1. Low top
2. High top, no cut outs.
3. High top, sight glass in top.
4. High top, cut out for ad glass (used by many companies.
5. High top, cut out for: Mobilgas, Mobilgas Special, Sunoco Dynafuel, Conoco Ethyl, Conoco n-tane, Conoco Demand.
There is also a series of tops for the Wayne 90. Since the part numbers are not the same I assume they do not interchange.
Inserts: Back when the tops were new and the inserts got damaged you could purchase a new insert, or you could purchase the individual letters. Has anyone ever found one with some individual letters?
Author, Gas Pump Identfication books 1st & 2nd Editions & Air Meter Identification books
We rebuild ECO air meters and sell parts.