The dash will interchange if you keep the passenger air bag. The problem is you loose the glove box, or gain a glove box depending on which way you are going. The bumper is a little different but will interchange. As far as I know, all the body parts will fit. All the interior parts will fit. Please correct me if I am wrong.
You can put a gen 2 transmission in a gen 1, but not the other way because of the crank sensor.

Paul

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84 500 SEL (307,xxx miles)