Power window assembly removal (74 Fury Gran Sedan)

Hello friends,
I have to replace the gears of the windows motors. I replaced the driver's one, but when removing the motor, I broke the compensator spring ("clock" spring?).
1 : where can I find it?
and 2, most important : is there a way to remove the WHOLE assembly, instead of only the motor? It would be easier to work on the motor,
Thanks, Sebastien
Author: Seb'74