Looking to go back to the original 15" size wheel. I had 16s put on some time ago. Problem now Is-I put way too many miles on my car( 70k+ a year) to be using performance type tires. It is more cost effective to go back down to the 15. Of course i no longer had the originals and am wondering if there are any other stock wheels from another make and model that i can use on a 2001 Gallant. I am going to start looking at the differant junkyrds for something that might work. Should I be looking for something other than the 15x6 4.5 sizing?

You should be fine with any rim as long as the bolt pattern is 5x114.3 with 45mm offset.