I had a '91 Caprice wagon and now have a '96 RMW. The '91-3 wagon middle seat back is a harder surface than the '94-6 models and I think it is a little taller. As for why he did it, we will have to wait for his explanation. I have been thinking about swapping the other way to make it better to haul heavier objects in my '96.why put a rear 94-96 seat in the wagon? (it's a newbee question, i know)