69's have verticle ribs or indentations on the portion that is visible from the engine bay. I think there are 4 ribs. these face inward towards the engine. The 69 RS will also have have the large hole for the bell crank. I just tossed a pair of beat RS ones in the scrap bin.
I am not sure how the 69's compare to the 67's or 68's as far are size/dims, but I know the shape of the fender opening is different. I do not believe 69's and 67/68's are interchangeable. Maybe someone who is better versed with the difference between the two can chime in.
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