Which wheels interchange on Sentra?

I have an '84 Sentra. It's my commute vehicle. Still running strong at 240,000 miles! I love it! It's time for tires, again. I want something beefier than the small 13 inchers that are on it. But, I need to keep costs low. Are there any 14" wheels from any other make or model that would bolt on? Something I could pick up in a wrecking yard, cheap? Wider would be better, too. Alloys? Also, how big is the bolt pattern - 4"", 4 1/2", or is it mm? Any help would be greatly appreciated.
Thanks,
John

The lug spacing on Sentra's is the same for most sport compacts, so just measure the lug spacing and run to a junkyard. Trust me, you'll have a HUGE variety of wheels to go for including: 13s, 14s, and maybe even a few 15s...