All I know is 1978 LREs had 15x7 in the front, 15x8 in the rear.
1979 had 15x8 all the way around.
They were made by Western Wheel Manufacturing, Inc. so would most likely have some form of their logo stamped somewhere on the wheel (looked like this in the late '70s:
), most likely in conjunction with the Chrysler Pentastar.
Hope that helps somewhat!