Any linear actuator with a 2" stroke will work. The one I used is no longer available. Get one with internal limit switches. Higher force linear actuators tend to be slower, preventing the wiper door from closing on the wiper arms.
I removed the scissor mechanism in the wiper bay and connected the actuator to the arm that comes off the cross shaft.
You replace the OEM limit switch with a dpdt microswitch (ebay). It mounts in the same place.
You can manually operate, making it simpler. I chose to use 2 relays to reverse polarity so it would work with my dash wiper switch.
2" linear actuator
Couple pieces of metal for bracket
Pic showing actuator, dpdt limit switch/diode