Did a little searching on this topic and couldn't find anything. Is there someplace that will sell you just the lugs for the peugeot wheels?

4x4brat makes them I believe but don't know if he has any left.

 

Here is a thread with info.

http://www.ultimatesubaru.org/forum/showthread.php?t=49131

Do steel and alloy pug wheels use the same lugs, or will steels take standard lugs?

Depends on the steel wheel. The 504 Steelie uses a really bizarre one. The alloy ones in my opinion are all the same or interchangable but still not compatible with a Subaru nut unless you use the spacer/adapter. Some folks recommend using longer studs with some of them as well as there aren't a bunch of threads to spare here and the wheels are thicker than most Subaru wheels.

Should've looked here first I guess:

 

http://www.indysworld.com/80s/general/wheels/pugdiffs.jpg

 

http://www.indysworld.com/80s/general/wheels/pugnuts.jpg

I have some of the pug lugs for steelies.