I looked through the information up in the first post and found the serial numbers and corresponding years mine 215144 J shows it as being a 1960 cub. On the side of the transmission below the clutch pedal it shows 351688 R3 L3 what does that mean? then directly on the other side of the transmission it shows 360719 R1, any meaning to that? then on the side of the engine block i see 251341R7 L any meaning to that? I am content with it being a 1960 i just was wondering if anything has been changed or anything through its history?