I did a lot of research on this topic for my '68-'72 production totals print. Here is what I concluded:
F40 was a standard part of the '69 SS package. Every '69 SS (except El Camino) had either F40 or F41. but the '69 Chevrolet Chevelle option totals report shows 28,749 F40 cars and 86,307 Z25 (SS) cars. It may look like there are more SS cars than F40 cars. But in reality, since F40 was part of the Z25 package, the 28,749 total does not include SS cars. In other words, there were 28,749 non-SS cars in '69 that had F40.
There were 722 F41 cars built in '69 (the first year for F41). Interestingly, the Chevrolet records indicate that the F41 package was available on any Chevelle (2 or 4 door), wagon, or El Camino, SS or not.
For '70-'72, F41 was part of the SS package (except on El Camino). The '70-'72 Chevrolet reports indicate that F41 was available on any V8 2-door or 4-door Chevelle (but not on wagons or El Caminos).
There is no way to know for sure how many non-SS cars in '70-'72 had F41, but the total was fairly small. Most of those were probably police cars or taxis.
Team Chevelle Gold Member #11, ACES #701
Author of the GMC Sprint, El Camino, and '68-'72 SS Authentication pages.
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