1969 gmc 940

[FlyboyWall]

Hi, I'm brand new to the board and it's great to see and read all about everyone's rides!
I just recently purchased my grandpa's old farm truck. I rode around in it when I was a kid and I just bought it off of the farmer that my grandpa sold it to.
I'm having a lot of trouble finding out information on these trucks. I think for the most part, the interior and cab in general are the same for a regular 1/2 ton truck, however there are a few things I need to find which are not on the 1/2 ton trucks.
Is there a website that supplies parts for these trucks or even just more information?

Thanks