[Grady Clay]

Randy,
It was the '69 model year.
Generally speaking, '65-6 had Nadella axles, '67-8 had the smaller 6-bolt Lobro, '69 went to a longer axle (to acomodate the axle being angled back for the longer WB) with a large 4-bolt, 2-roll pin Lobro CV. Generally '69-'73 are all the same and use a CV gasket. I think? '74 was when they went back to a smaller diameter Lobro CV.
Of course there are exceptions. A '69 when ordered with a LSD came with an Aluminum casting and Nadella axles. A '75 930 had the larger CV, etc.

The axle flange at the transmission will interchange all through 911 and 915 but the offset toward the CV is different among dozens of different flanges.

If I'm wrong, someone please correct me.
Best,
Grady