1938 - 1939 - 1940 Dash board differences, are they interchangable.

[mjeds]

I'm familiar with the aftermarket dash you have, it vaguely resembles the dash from a '40/1 Ford pickup.
It may be picture quality, but the repro '40 dash doesn't appear to have the openings at either end for the ash trays (online search for pics of originals you'll see what I'm referring to). There are vent outlets made to fit in those square ash tray holes to avoid the under dash apps.

Correct no vents/ash tray locations.. there are 4 versions of that repro '40 dash..

1. no gauge or ashtray cutout (i.e.. you custom cut), with speaker and glove box cutout,
   
2. no gauge, speaker, or ashtray cutout, with glove box cutout
   
3. gauge, speaker, glove box cutout, no ash tray
   
4. gauge, speaker, glove, and ash tray (pre-installed with circular vents)

however Scooting offered me his Original 1940 Dash as he is installing a custom, if that works out then I will have an original with all the proper openings and I will likely fab speaker mounts into the ash tray locations, and then put the vintage air vents behind the original center "speaker" grille area.