42&47 Chevy truck firewall replacement

I need to replace the firewall on my 42 Chevy pickup, someone has cut it up pretty bad and they do not make one that I can find a replacement for that year, they make them for the 47's, has anybody use a 47 firewall on theres, are the measurement the same on a 42 and the 47 pickups, I can get a smooth one that looks like it may work but not sure of the measurement thanks

 

no the 39-46 early 47 are different then late 47 are long and different it other ways i would look on ebay or stovebolt or this site and place a wanted ad for one the do came up.thanks

 

thanks I've been looking on ebay

 

the smooth one at Chevs of the 40's is shorter but from drivers side to p***enger side I am not sure on