Thanks for the information. I had assumed that the M-2 Monroe bodies and the 490 bodies would be identical. I had hoped that when I get finished with this project that I could sell someone my 490 chassis with its radiator, motor, transmission, rear end and wheels,and the extra Monroe body. Now I'm afraid that may not be as feasible a project as I thought it would be.
When I bought the 1916, it came with a plank of wood cut the right size for a dash and it fits the body quite well. However it is about 1/2" too wide to mount the windshield on. If I trim the length by 1/2", the windshield will fit, but the cast iron brackets which attach the dash to the door jams will have a 1/4" gap on each
side. There may be enough flex in the door posts to make up for this 1/4" but that may mess up the door alignment. I guess I will make the dash fit the windshield, and deal with the doors if they become a problem. I still have questions about the firewall, that are listed in my original post. Thanks, Ed Emerson