The centre switch panel is different also. On the 4A, the "cowl" is under the switches, and the bottom of the timber dash is straight at that point. On the TR5/6 the cowl is over the switches and the bottom of the dash is indented to suit. How do I know all this? The timber dash panel on my 4A is a bitsa. 4A air vents with 5/6 centre panel. Long story. All you need to know is that it looks great and was cheap!