Ed, the 5045587's are power window motors for the right side of the car. I found exact listings for this number in a Buick parts list for 1969-70 A body front door on the 2 dr hardtop (-37 body type) and conv (-67 body type). Also for 1969-70 A body rear on 4dr hardtop (-39 body type). This list only covered 64-70 A body Buicks.
I think the number will fit on many more GM cars and years. It was installed by Fisher body, so it was not a special Buick part. A 1971 Cadillac Master Parts List shows it to be correct for all 54-70 models and some 71s.
The number seems to have been around for only a few years beginning in the late 60s. Earlier and later parts lists show different numbers for this motor application, but lots of models and years used the same one.
The 5045388's are power seat motors. Exact listings show this number for the horizontal and vertical motor on all 66-68 Buicks with 6-way bench seats.
It was also used on 69 A-body Buicks with 4-way power seats for the horizontal and vertical motor, except for bucket seats. It was the second type motor of 3 types used on the mid-size models that year.
The others have not shown up in any lists yet. A quick check of the 65 Riviera headlight motor and various station wagon tailgate window motors show similar 5045xxx numbers, but no matches.
Will report more as hopefully additional info becomes available.
What has been, can be again. (Bob Wills, 1942)
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