Comparison : Item # 102 1/2A8, Sprocket Number 102 1/2
Item # 102 1/2A9, Sprocket Number 102 1/2
Item # 102 1/2A10, Sprocket Number 102 1/2
Item # 102 1/2A11, Sprocket Number 102 1/2
Item # 102 1/2A12, Sprocket Number 102 1/2