The service bulletin says they were installed in the production line by September 1972. Look at the production date on your car pop riveted to the door post.
My car is 4460. Produced 9/72 and is a '73 L model.
It has the kit.
So to answer your question, if you look at the unit numbers, mine is somewhere about 1/2 through total production.
The answer is 50/50. 1/2 have them, 1/2 don't.
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