aren't they just an "A" series truck?[/QUOTE
I believe you are right. In the Dodge Pickups History and Restoration Guide 1918-1971 they are described as: A 100 and A 108 Compact Van and the A 100 Pickup. Appears they were their own platform and not based on any car or full sized pickup platform.
The story goes that Chrysler's engineers went out and bought 10 Econoline vans and dismantled them and even cut one of them up and decided that they could improve on that design and basically that is where the platform evolved from.
As far as parts, there is not very much being repopped for the A series or the D series trucks. There is a sister site "For Trucks Only" which has some parts and owners with knowledge you may be able to use. Usual high priced E-Bay stuff. You can also try Sweptline.org, a lot of pickup owners also have A series stuff for sale also.
