I just finished mine. I used a 2" actuator. Purchased from the same link shared by RM1SepEx. If you need to shortened the stroke you can by removing the cover and exposing the end switches. I drilled and tapped the end of the actuator to allow a 1/4" threaded rod for easy cable adjustment.
http://https://photos.google.com/share/AF1QipP6_L9qaBV1l7i3yx8h9XBZnBPP7fRzj1pR21zo12XN5u DIYNJcxE0X8TaC1kQETw/photo/AF1QipMW-VGC0WsgYVR1ayg_R1uzFHu-TqWT6M4Eqfw1?key=bjRmQ1dqSHJHcE5JeGVNaVl3S1FIcm9yR mpwOFVB
http://https://photos.google.com/share/AF1QipP6_L9qaBV1l7i3yx8h9XBZnBPP7fRzj1pR21zo12XN5u DIYNJcxE0X8TaC1kQETw/photo/AF1QipO10QBAS47boO5cV2yyFD8-IN7Np8sMKvfWHWH3?key=bjRmQ1dqSHJHcE5JeGVNaVl3S1FIc m9yRmpwOFVB