This may be helpful. Not sure if correct info but it all makes good sense putting up and not having to try bolting to crossmember. I did the search for 46 1/2 ton truck.
Upon another question to AI as to why the holes on top bracket are there and not used on our truck was in different applications that piece was used to hold spare to bed front wall or side wall if you didn’t have the sliding rail.
Glen
Update with factory picture this shows the bracket just bolted to lower bracket
Last edited by Ponchogl; 07/05/202611:14 AM. Reason: Update and factory picture
1946 Chevy Truck 216 1/2 ton "Tales from a weekend mechanic" Follow in the DITY