We had a rack that attached to the front of our F-250 years ago. I liked carrying the bikes up front (the bug splats weren't fun though LOL). We used an adjustable rack that fit onto the rear of our car, but it worked well on the front of truck too.
I can't help you with the bolt, but here's an idea if you are still looking for what you need.... are you a member of a Dodge Ram 2500 (diesel) forum? google around and find a forum for your truck. I know that when we have questions about our truck, we invariably find the answers at the Ford 150 forum. Hope this helps some