[GaryVoshol]

Wheels aside, I presume the C-channel things sticking up on all 4 sides are for bumper attachments? You would have a bolt of some form that comes out of the bumper and fits the slot on the channel, and then is tightened down.

My question is if you've checked the size of the frame. The channel adds a bit of width I think (can't tell for sure, but it looks wider than the end pieces of the kit frame). Beside that, there are bolt heads sticking out. A kit frame doesn't give you much leeway with the 28 inches - 3/8 or 5/8" as I recall. Check if you'll still fit in the box.