They were never coach builder specific.
It's my understanding that these procar window regulators stayed the same for a multi-year period. '61 Superior that I pulled last year were identical. '71 and up coach regulators themselves are likewise the same, although the armature may be different length. I've never had opportunity to match up pre and post '71 side by side firsthand to check widths.
It has been proposed that the window regulator mechanisms stem from Series 75 limos although they had different width rear doors. I have no reason to doubt this tidbit. As far as hailing from a station wagon, definitely not side doors anyway. Those were entirely different. I've seen many '71-'76 GM wagons dismantled through a derby friend.