Sources for 3 speed saginaw OD

[JulioK]

Like so many folks I'm hunting for a saginaw 3 speed with BW OD. What other vehicles used that setup? Were there cars that used them and if so would they easily adapt to my truck? (I mostly just drive it and am not hauling stuff much) What years were they produced? I have the 7 bolt non OD with my 72 lwb but run up and down the interstate several days a week. I believe the units below are what I'm looking for.

"The GM designation for the Saginaw is SM326. The tail housing on a Saginaw OD will have "R10Q-1" cast into it."

Needle in a haystack?