F/J/M bodies are so similar, you can swap front doors and windshield between a 1989 Fifth Avenue and 1976 Dodge Aspen.

Headlight switch was common for many years, noticed this when I replaced one in a 1994 Spirit and it looked very much like the switch in my 76 Power Wagon.

As mentioned earlier, the big square radios interchange from the early 70s thru 2001 on many models. I have late model radios with CD in both my 76 Power Wagons.

Several years, the 2.5L Dakota 4cyl engine was the AMC design used as the base Jeep engine for many years.

Driveshaft out of early 80s J body Mirada, 318/auto, fit perfectly in my 67 R/T with 440/727 and 8 3/4!

Many parts interchange amongst all the EEK (every extended k car).

A friend of mine adapted an AWD system from an early 90s minivan into a 91 Plymouth Acclaim, although that wasn't exactly a bolt-in.

JS