ARM-WIPER ASSY

lower cap only part# 10110070 this has a 3/8 attachement
Wiper head cover might also be 10504309 this has a 5/8 attachment

Arm will not have any ridges when new. The torque procedure creates the
spines by the pivot shaft cutting into the arm.. 50 ft lbs.. wait at
least 1 hr and re-torque to 50 ft. lbs. Do not operate the system
between torque procedures.