1935 Ford coupe heater

[blucar]

Originally Posted by Kube

Well, at least in 1939, when Ford did authorize a hot water heater it was placed darn near center with no interference issues with the shift lever.

When the attached pix is reviewed, it can be noted that the center mounted small '39 heater is quite close to the trans shifter tower.
In all probability the '41 and later, and/or an aftermarket heater, like the Arvin that "Copper" posted would not clear the floor shift on '39 and earlier vehicles.