[Mike C]

OK, making progress. Seems I had the rear aluminum flipped side-to-side. I swapped them because only (1) bolt went through my original top holes. Now with it flipped I need to drill a new hole in the bed rail. The 1/4" sheet metal screws for the bow brackets are too short, won't engage the bed rail, so I'll get different fasteners at lunch today.

For anybody searching for clarification, the front body aluminum has 1/2 a bolt hole at the rear and the rear body aluminum has 1/2 a hole at the front that lines up with the front one. This is not in the instructions. Note that it says you use stock top holes, but at least in my case I'll need to drill at least one each side.

The instructions say use the aluminum as a template. The holes for the bow brackets are drilled slightly smaller than the holes for the body aluminum to mount. The rear bow bracket has (4) holes drilled in the bottom unlike the front which just has (2).