Just like The title says. Do you know if Ford changed the design of the 28/29 roadster seat for 30/31 roadsters? Wanting to know if they are interchangeable
All that I know is that the seat springs are different enough for Snyder's to sell them as different part numbers. A person could call them. They may be a bit wider due to the advance in the body design between the 1928/29 and the 1930/31. There likely isn't a lot of difference between the two.