GMC 1976 ZEO 6083 Maintenance Manual page 38

Figure 36-Wheel
plywood sections can be replaced; however, repair of
plywood floor is more practical and is corrected later
in this section.
The engine cover, the only section designed to be
removed, is located between the driver and passenger
seat and is secured by a lip in the front and two screw
attachments at each rear corner.
Housings and Floor
BODY 1- 2 1
The front wheel houses are made of plastic po-
lyethylene while the rear wheel houses are fiber glass.
The front housings are repairable or replaceable if
damaged. The rear housings are repairable of da-
maged. The entire underfloor area has been sprayed
with a rust preventative and sealer undercoating .