Please Note : Communication is the best way to solve problems. If you have any problems after purchase, please contact us in time before opening the return . We will give you a satisfying solution. Application: Replaces for Meritor R801073, Automann 139.2831, E-11401 Replaces for: R801073/05-363/E-11401/2018227C91/R801072/R801079 R802440/R802441/3947646/8086517//05363/E11401 Description: Type: Automatic Slack Adjuster Features: Easy Installation Spline Diameter: 1.5" Spline Teeth: 28 Arm Length: 5.5" Package included 1 x Automatic Slack Adjuster (As Picture Show) .