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Kimble,

Photos of the 64' front spring rear shackle parts are below, along with measurements. Looks like the 64's are about a 1/4 inch longer/wider, then 61's.
o pin overall length is 5 inches;
o bushing overall length is 2 1/2 inches;
o bushing OD is 0.868"; and
o pin OD for bushing threads is 0.657"

Also a couple of repeat photos of how it all goes together and new parts used, for others reference.

Are the 61' parts the same except for length? Looks like the extra length is in additional threads that go in the bushing.

Les