I have 15" steel Cragars on my E. And yes, the offset is -12mm, so they stick out from the body by 2-3 inches. But that is the look that I want/like.
A jeep's bolt pattern is 5x4.5, so those will work. I test fitted a 92 wrangler wheel, and it DID NOT fit. The offset was wrong. If I was looking for some jeep wheels, I would look for some 17" ones, but I dont know if they have the right offset.
The Cragars that I have are the D-Window, and they seem to be the only ones that fit. -12 and -13mm offset work as well. They were really cheap ($50 each) and the tires came to be more than the wheel..
Let me know if you need more info or pics