I can’t find a source for the part(s) on pp. 286 of the assembly manual. The brass fittings with orange colored push-ins shown. Any pointers would be appreciated.

Just got the robot running. Running AR2 software. Able to jog all motors forward and back. Went to Auto Calibrate and this didn't look right. So decided to Calibrate each axis independently. J3, J5, J6 work correctly. J1,J2,J4 do not. They go forward then back a little, if I try to calibrate again it moves forward then back a little. Eventually I need to manually rest the position it moves forward more than back. Not sure what to check first?

When comparing to the previous version AR3 parts are looking great. So may I know what type of finish it is?