Not all of the items you listed are unique to the "series 1" cars. My car (4/71 build) is an early example of what some people in the U.S. call a "series 2" and it has, or originally had several of those items:
E31 head
Series A transmission
4-screw SU carbs.
Dash mounted hazard switch
Unused depression above the hazard switch.
A lot of those things you list are common to all of the pre-73 cars.
(or perhaps even to all of the 240s)
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