Been working on these seats for way to long. In my mind it looked easy but I've basically cut these wagon seats completely apart and put them back together. So the driver's seat was 2 inches to wide, the back was 3 inches to tall, the back angle needed adjustment and the mounting brackets had to be reworked. The passenger seat has really been a challenge because it needed 3-3/4" added, a new hinge and feet , and because the back tubes were rusted through, a new back.
I think its finally getting close though, just a few things to finish on the passenger seat and it should be done.