Is an 8 1/4", 2.45:1 diff housing exclusive?

I see about a dozen or more Dakota's every time I go junk yarding.

I even see M and sometimes F bodies as well.
(Saw one last month and got the power trunk release)

I haven't seen anything with an 8 3/4 in over 10 years and that was a 68 C body.

It would be nice to know if you could build a 3.55 SG 8 1/4 from relatively cheap junk yard parts.