I used to work with a guy really named Jack Daniels - he had a small fishing boat over in New Bedford named "Old #7".
The full size, rear wheel drive, Cadillac 16" wheel has the same bolt pattern as a Porsche 911 Fuchs wheel. The DeVille's are rear wheel drive and have 16" "Space-Saver" spares, and they fit right onto my 5-lug Porsche adapters (I'm using one now - see picture below).
HOWEVER! The mounting flange is much thinner on the space-saver, and you cannot use the Porsche lug nuts with the caps on them, so you'll have to get another set of un-capped (open hole) lug nuts to use on the spare (I'm pretty sure they're regular 14mm nuts). Make sure they're "coned" on the bottom to center the wheel (Bolt-centric!). Since the stud will be sticking out farther once the spare is on, you'll also have to carry a 19mm deep 6-point socket to run those open lug nuts on (It'll also work on the Fuchs lug nuts).
I made a junk yard run (Geez, Ron, You must have pretty crummy junk yards over in B.C........) and got the spare, the plastic spare cover, all mounting hardware, a scizzors jack from a Ford Windstar (partly 'cause it has a 19mm lug wrench attached) AND a bunch of 19mm lug nuts all for $20 (guess I got more stuff because none of it says "Porsche" on it!)
Ron O: Try driving your IM over to the yard and shmoozing them a little - maybe even give the guy a ride - always works wonders with me! Hell! I also got a pair of perfect Chrysler LeBaron bucket seats (same color as my interior) for $75. Too bad they're too wide, they woulda looked great!
gn