Here's all the pics I have, didn't take many with it on. If it's not the rugged ridge rack, I am not sure what brand it could be because the PO installed it. The inside bracket, the skinnier of the 2, uses the bolt holes for the spare tire carrier. The 2 outside brackets used an existing hole on the top of the bracket and the bottom hole was drilled.
I will wake more pictures of the rack itself this evening. If i had to guess the sides are 6" all the way around.
As far as fitting with a swing away tire carrier, it would depend on the size and height of the tire really.