hello and welcome to FTE !
I think your best bet is to look in your local junk yards - and the internet .
www.ebay.com is a good place to look - auto krafters http://www.autokrafters.com/mainframe.html
dennis carpenter inc. http://www.dennis-carpenter.com/trucks/index.shtml
.
Have a look around I think you will find the
1948 - 1960 forum also helpfull .
Once again WELCOME!!!!