1947, & early 1948 model G.M. trucks only, had the non re-inforced firewalls. The re-inforced firewall was introduced, in the late 1948 G.M. truck production line.

Spanky Hardy
Collector Of Fine Old G.M. COE Trucks & Antique Holmes Wreckers

1948 Chevrolet 5700 COE Holmes HD W35 Wrecker
In the Stovebolt Gallery
More pictures on Photobucket

1950 GMC 250 1-Ton
In the Stovebolt Gallery