I had some old servos laying around so I remixed the arm and slider to accommodate them. I also incorporated the servo arms directly on the pinion and gripper. See https://www.thingiverse.com/thing:2687600
I used old Futaba s148 servos for the slider, but these 25t spindle servos should work fine:https://hobbyking.com/en_us/hxt-5010-twin-bearing-digital-servo-6-9kg-0-16sec-39-2g.html?___store=en_us
These are the servos I used on the gripper:https://hobbyking.com/en_us/turnigytm-620dmg-high-torque-ds-mg-10-6kg-0-13sec-52g.html?___store=en_us
Note that in my experience, servos with standard angular throw work fine, No need to use 160 or 180 degree servos.