I have a question about OME rear leaf springs for the 60 series. Why is there a separate part number for the right and one for the left? Are the two leaf springs different from each other in some way?
Yes they are slightly different. The A spring (drivers side) is apparently a bit stronger to support the weight of the driver. It also helps some with "cruiser lean", although some cruisers lean the other way.
A simple search on the topic will give you enough info to put you to sleep.