[petehoovie]

Originally Posted by Model51

Trucks typically had a foam rubber piece around the base of the hand brake lever underneath the transmission cover to fill the gaps. Same with the transmission tower and clutch and brake pedal arms.

I don't have definitive information for 1939 trucks, but have what was installed for 1935 - 1937 trucks which likely is similar. The attached image shows the foam seal around the transmission tower and the one for the parking brake lever. This fit under the transmission cover.

Over time the foam tended to disintegrate and "disappear" so the information I have comes from Ford Engineering drawings and some original parts.

Hope this helps.