Originally Posted by True Faith
I thought about it briefly, but the spare tire is a bit of a pain to source, and while I think this setup is well worth the trouble and expense, I'm not sure how many people would really be willing to pay $400+ for it (which is probably what it would have to cost to make any money on it, given shipping costs and whatnot).
Other that the tire (which at least in theory can be ordered from a Cadillac dealer--that's where I got mine), the rest of the stuff is pretty easy to get your hands on. Don't wait until you get stranded...
The Cadillac dealer here was not able to help me, but a dealer search at http://www.maxxis.com
turned up local dealers.