Here's the spare wheel and tire VS installs as an option for four-bolt cars. I think they have something similar for wide-5's, but I'm not sure - give Kirk a call.
This is a narrow rim and Chinese 135x15 tire, which will probably get you home in a pinch (don't try running Auto-X with it, though).
If I recall, it was $125 for rim and tire. You could probably do better at a junkyard, but there's a day out of your life and maybe a skinned knuckle or two as well.