Originally Posted by dinger
The firewall is different. The 36 that you show has the X pattern on the side of the firewall, the 35 had windlace that went down the side of the firewall, the 36 had rubber snubbers. Other than that, both year firewalls are the same. The "X" pattern was used to stiffen the side of the firewall for 36.
I knew it had to be something small or that you could not see it. I couldn't find a picture of the 35 with the side panel off, but looking at Brian's picture knowing the outside was the same, I thought , I wonder if it's not the firewall, sure enough. I didn't get the answer, But the 36 model 48 I think was the same as the 35, but they made less than 100 of them then changed to the model 68.
Great question Brian.