Brake Light Identification

[dirtcop]

Hi - Does anyone recognize my brake light on my 1926 Touring? I want to clean it up in preparation of putting car back on the road. I think I just need the center part of lens (did it say "stop"?) or do I need to replace all the lens? Don't know if brake light is off another car or aftermarket. Need help in knowing where to look for replacement parts. Thanks, Brian