i just aquired a rubber key boot, and soon found out that the key i did have, with the black plastic top, was just that, a short key blank inside just a plastic ring, i tried to cut off the plastic only to find the key only went in like a 1/4 inch, and definately wouldnt work with the boot, the dealers was no help, so i went to the locksmith and got 2 new keys made, but had to grind and cut it down to fit into the rubber boot, then "goop'd" it in there and drill the hole for the key ring
worked good, but way more hassle than i figured