Comparison : Item # 35BB20H, Ball Bearing Idler Sprocket Hardened Teeth
Item # 40BB17H, Ball Bearing Idler Sprocket Hardened Teeth
Item # 40BB18H, Ball Bearing Idler Sprocket Hardened Teeth
Item # 50BB15H, Ball Bearing Idler Sprocket Hardened Teeth
Item # 50BB17H, Ball Bearing Idler Sprocket Hardened Teeth