Hi Jon,
I was reading old posts and would like to offer a comment about the chrome plated central "stack" in 1941 Buicks. They are all interchangeable between the various series, however, the 90 Series central panel differs, from the other series, in two minor ways:
(1) The lower right control knob on the 90 Series is marked "HEAT CONTROL (with a CW arrow) HOT". The other series panels are marked "ON (space) FRESH AIR (space) OFF". This difference is due to the fact that the 90 Series have a thermostatically controlled heater.
(2) The metal screen (over the radio speaker)has square holes, rather than round. Also, there are low raised plated horizontal ridges between the hole rows. The area between the ridges (the hole line) is painted black. This forms a decorative pattern.
Jon -
I have a very nice SoCal 1941 90 Series central dash panel from a car that Gregg Fields (BCA #1) parted out many years ago. The panel could be used as is, except for the metal screen, which should be cleaned up / restored. If you need one for your 90 Series restoration project, please let me know.
Grandpa