truckernix,
Here is a pcture of a '54 truck radio with incorrect knobs but it has the metal panel to which the oval speaker is attached. The foam seal on the front of the plate is totally degraded (does anyone know of a reproduction foam seal - the 47-53 truck seal is different).
http://home.nycap.rr.com/lederman/images/54truckradio.jpg The plate is held to the radio by the bolts over the two tuning posts.
Let me know if you want more photos and/or scan of the repair manual diagram/picture of the radio.
Tim
