Anyone have any leads on a stainless steel replacement backplate for the iPhone 4? I have found a few links to vendors on eBay and web sites that carry replacement backplates, but none of them seem to say if it's steel or aluminum. I specifically want stainless steel, and specifically a replacement backplate, not a stick-on skin for the current backing. I would like to find this because I have a few of those camera lenses that use magnets on the ends to attach to the case. Usually you use adhesive to place a metal ring on the case to receive the lens, but if the backplate were magnetic metal in itself, that would be much more convenient.