Guys, The big National Service Manuals have quite a lot of info on these units. I have several manuals- the 1937 one has a complete list of applications for these. If you need specific info, I could post copies of the data. Auburn, Cadillac, Chandler, Chrysler, Essex, Ford Franklin, Hudson, Hupmobile, LaSalle, Packard, Peerless, Reo, Whippet and Willys Knight are listed as using these (types 5 - 15)