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According to my Hollander manual, the 64-66, 67, 68, 69-71, 72 and 73-76 are all different.

67 is 22 x 26 x 1 1/8" (encased rubber bushings and all two leaf but 3 different weights)

68 is 22 x 26 x 1 1/8" (different rubber bushings but 2 or 3 leaf)

69-71 is 22 x 22 x 1 1/8" (same bushings as '68 and 2 or 3 leaf)

For '72 it's 22 x 22 x 1 1/8" (2 or 3 leaf)

The wierd part is that it shows the dimensions ecactly the same but it also says they do NOT interchange. Have no idea why. It only lists '72 jimmy, '72 chev and GMC conv. cab trucks as interchange.

then '73 up is 23 1/2 x 23 1/2 x 1 1/8"