It wasn't a 489 8.75, because the last of those left the factory in '72. 9.25, maybe?
But apart from that, they could be special ordered on anything. Except for the relatively rare performance packages that died out in the early 70's they will be the very rare exception, not the rule. Later 9.25 axles may have had more LS diffs, dunno.
A run-of-the-mill '72 New Yorker sitting in the boneyard will almost certainly not have a Suregrip.
The 8 3/4 stopped at the end of the '74 model year. All the '73-4 E-bodies had them and many of the trucks and vans had one as an option. The Imperials all had them in '73 but changed over to the 9 1/4 in '74 (which also has disc brakes!)