a 2.93, 3.08 and 3.23 carrier the mid 3 series carrier 1 13/16" TO 1 7/8"
The steep 4 series carrier 3.36 - 4.33 and beyond is 1 15/16" to 2" height the way you are measuring.
The lower freeway 2 series is 1 1/2" to 1 5/8" (ratios are 2.56 and 2.78 )
USE THE PICTURE PROVIDED TO HELP MEASURE YOUR CARRIER....
MORE INFO
This is the same for Posi or Non Posi carriers
just to be clear
NOW watch out as BUICK in 1968 -1970 has its own carrier you will run into at swap meets - their measurements are slightly different than the Pontiac and early BOP 67 and older PLUS the fact that the Buick carriers have larger driver side carrier hub and bearing.
They have 4 carrier breaks where pontiac has 3 carrier breaks.
The unit you have pictured is a early 64, 65, 66, 67 lower horse power posi unit
only 6 bolts that hold it together and you can see into the cone cavity and see the casting that holds the bearing on has BIG windows...THIS weakens the casting
Super duty and later posi unit do not have this which they thought was a good way to get fluid to flow through the unit etc.
The ring gear bolt holes should be for 3/8" right hand thread bolts
LAter in 1970 -1972 and maybe even late 69 the Bolt holes were drilled larger to handle the 7/16" left hand thread bolts they still use to this day in the 8.5 and 7.5 rears.
Aftermarket posi units will need to be drilled to make the 7/16" bolt fit through the case and into the 1970 -1972 ring gear 8.2