Relocate spare tire

I'm going to move the spare tire from the rear bumper to under the front compartment on my new fiver. Already ordered the Lippert tire lift. But I need help with the mount. As I recall on a previous rig there were two steel tubes, probably 1.5" x 1.5" running front to back. Then maybe a flat steel plate that the lift was mounted on. If anyone has a similar setup, can you tell me the spacing between the tubes and any other details that could help. Thanks