Ed,
I just got done working on the 46..I think I know which part you are talking about...I think you mean the floor piece that is spot welded to the cab, right about the front cab mounting bolt area?
I have not seen that in replacement part form. My only suggestion would be to find a cab that is headed for destruction and pull them out. My spot weld on the passenger side let go and I need to finish it off and get it put back in.
Not sure if you found this to be true on your truck, but underneath this panel, the void areas were full of dirt and gravel. I can tell what my truck did for a lifetime...still lots of North Dakota grain still being hauled around in that cab! I can try to post a picture tomorrow, but am off to work right now.
