Perhaps the factory accessory installation page from 1960 will be of some help. I assume it is the same through 1965. Unfortunately there are no dimensions included.

[IMG]http://img651.imageshack.us/img651/1538/1960accessories110.jpg[/IMG]


1960 GMC 1/2-Ton Pickup Truck
In the Gallery
Updates in the DITY Gallery
Now cruising in the Passing Lane