The body ID plates, "Vehicle Serial Number" plates were held to the from with:
- hex-dead/clutch-head-center screws hex-dead/clutch-head-center screws (1939-1950, supposedly)
- rivets (1951 and later, supposedly)

Here is information on ID numbers and serial numbers.

Here is not-as-useful information on IDs and serial numbers.

Jim Carter info

I trust Brad's information.