Question about buying Carter BBD for my 318 (unless I should look at something else)

I'm flipping through rock auto and the first year they show for the thicker mounting gasket is 1970. The specific gasket is Fel Pro 60188 (9/32 thick). in 1969 and all prior years they show Fel Pro 60045 (I'm guessing 1/16 thick from the photo).

Maybe the BBD's didn't come from the factory with the thicker gasket until 1970?