Door Window Regulator ID???

[westie47]

How do I determine which regulator is driver side and which is passenger side? When I removed them I didn’t realize they were different. The only number I can find is EM 47 on one, but haven’t been able to find out anyplace.

 

[RussT Plymouths]

The coil spring is there to help lift the glass, when the window is rolled down the spring will be under more tension.

 

[6pktgo]

There is also a stop pin, pressed into the bracket & in the opposite position, side to side.

 

[1967coronet]

How do I determine which regulator is driver side and which is passenger side? When I removed them I didn’t realize they were different. The only number I can find is EM 47 on one, but haven’t been able to find out anyplace.
View attachment 1264591

Top one is left, bottom one is right.