My wife has a 1990 Toyota Corolla DX sedan and I was wondering if I could retro fit it with 40-60 folding rear seat backs from a similar year Corolla wagon? It has the tunnel, but the seat back is solid and non folding. Is it possible to do this or not worth it? We don't carry any passengers in the back seat so I don't think that would be a problem. I though of this today when trying to put my Mountain Bike in the back and it didn't fit. Just wondering. I have a wagon myself but if it is in the shop and I ride my bike and it later rains, we could most likely fit my bike in her car with folding seat backs. Just wondering? Thanks