Southtowns, I thought I had my pictures of the cab to running board in the album but obviously not. I will find them and load them tonight.
...in the meantime the body "rolls under" and there is a horizontal "lip" that the rubber lays on and is bolted to it. I THINK there is another metal strip that lays on top to keep the bolts/screws from pulling through the rubber. Worst case is I'll have to get under the panel and take some more pics...........its been a while since I did them.