I found the same thing in my '37, the back of the seat was too straight up. The buckets I tried never felt right, so I used the stock seat. After moving some padding around and setting the back on the forward most mounting position, it is much better. I also added stiff foam to the front edge of the bottom cushions, then raised them up to a steeper angle, it sets kind-a-like a bucket seat, not like the sofa it was before. I'm only 5' 9" so I have a little more room, it's no surprise they made the cabs bigger the following years.
