Early or late 72 dash harness?

[Demonic]

Our friends at Year One list an early and late ( after Nov. '71) dash harness. Anyone know the difference? Seat belt light maybe?

 

[CFD244]

I know the wiper switch plug changed between 1971 and 1972. The '71 is 2 pieces (to accomodate the 2 speed and variable speed switches depending on wiper motor option.) In '72 the variable switch was dicontinued and replaced with a 3 speed switch. IIRC the 2 speed and 3 speed switches in '72 use the same 1piece harness plug. Sorry if this doesn't help.

 

[Syleng1]

My Nov71’ build date 1972 Demon 340/4 does not have a seat belt light on the dash. I bought the harness for the whole car. 12/71 and newer also has electronic ignition, 11/71 and older is set up for points and a tach I believe.
The wiper harness connector is new to me. It does make sense.