[Part number for belt tensioner and pulley] 04854089AB 854089AB 04854089A[Fitment] for 69mm diameter pulley, for Grand II WG, 4.0 SUV 1999-2004, for Wrangler II TJ 4.0 SUV 1998-2007[Automatic belt tensioner function] Replace the old or broken belt tensioner to avoid noisy pulley and eliminate belt noise, achieve correct belt tension, adjustment and good performance.[Features of belt tensioner with pulley] Made of solid metal for wear resistance, not easy to break or deform, longer service life. Product specifications: Type: Tensioner roller Material: Metal Color: Silver Interchangeable part numbers: 4854089AB; 04854089AB; 04854089A; 38163; 89245 Type: Accessory drive belt tensioner Contact surface: Smooth/Back Outer diameter (mm): 70 mm Width (mm): 26 mm Bearing bore inner diameter 1 (mm): 17 mm Thread size: M8 x 1.25 Fitment for automatic belt tensioner: for 70mm diameter pulley For Grand II WG, 4.0SUV 1999-2004 For Wrangler II TJ 4.0SUV 1998-2007 Specification for belt tensioner and pulley: Features of belt tensioner with pulley: Replace the old or broken belt tensioner to avoid noisy pulley and eliminate belt noise. Achieve correct belt tension, adjustment and good performance. Torsion spring provides reliability and even tension Solid metal for wear resistance, not easy to break or deform, longer service life. Package contents: 1 x Complete accessory drive belt tensioner Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The allowed measurement error is +/- 1-3 cm.