Well, i can answer this one. Some of the trucks had duals from the factory, so you can get factory mounts. Or you can get a dual tray from someone like wrangler power products. Or fab up a mount. I forget if the stock blazer one is on teh passenger side or drivers side, but there were factory trays for each side for the dual setup. So basically, if you want to fab a mount, right behind the grill opposite the stock one would work fine.