Mine came with it already applied, but nothing but rain has ever touched it. If you just lift things when removing them instead of dragging them, no rear bumper protector is necessary.
No. It's a Chinese export Edge. Different countries have different laws.
http://www.ford.com.cn/servlet/ContentServer?cid=1248891278573&pagename=FCN%2FDFYPage%2FFord-Default&c=DFYPage&site=FCN
They're not a standard size. My Boston ISTS tweeters fit well, though. They're some stupid impedance like 3.2 or something. You can always use higher impedance, but not lower.