I am looking at getting new rear quarter panels for my truck. I would really like to go with the steel ones but for some reason the aluminum ones are cheaper!! I would buy both the rear quarter panels here from either: Aqualu (aluminum) http://www.aqualu.com/FJ40 Pics/FJ40.html or 4wheelauto (steel) http://www.4wheelauto.com/pages/par.../pages/body.htm . But my question is how do you connect the Aluminum to the steel tub?? You cannot weld aluminum to steel can you? I don’t really like the pop rivet way of doing it. How else do they mount them? Thanks Rob.