1-1/2-28 Spline, 5-1/2″ Arm. Same As Midwest WAR801073, BWP M-4046, Automann 139.2831, Keene KR801073, Meritor R801073, Fleet craft FC01073, Dayton 05-363
Meritor automatic slack adjuster
R801073
Aftermarket replacement
Good quality from Good Auto Parts.