The B-Model picture was just for identification. They made lighter models as well.

But now, I believe I know what style you are referring to. Although if I'm right, I got thrown off by some of your info and desrciptions.

Does your truck look like this:

http://img.machinio.com/fl/719916915.jpg



'60-'72 Chev/GMC Fan
GMC 9500 Fan
Detroit Diesel Fan