904 front pump,non lockup

Ok. I have 2 pumps. One I know is from a 67. One is from 68 and newer.
They have the same spline (26).
The splines shafts are the same dia on the outside but the 68 is larger dia inside.
15609750239073591870806236443552.jpg
On the back side of the pumps the shafts are different. 67 on the right.
What year is yours.
15609751496677947135742752472336.jpg