on vehicles up to 8 of '86 there were two (left + right)
Directions as follows:
control unit ...remove.
lateral covering on center console left or right...remove.
When replacing the left vacuum element ...remove air duct for rear
passenger compartment.
When removing left vacuum element... remove strut
Vacuum line on element...remove
Actuation rod on lever...press off
3 locks... press off
In reverse order...install , mounting the locks with rubber washers

on vehicles as of 9 of '86 (only one actuator)
Directions as follows:
control unit ...remove
Vacumm line ...pull off
Actuation rod on lever...press off
Vacuum element from holder ...pull off
In reverse order ...install