Decode Slick Magneto Part Number

[CharlieWaffles]

How do I decode these Slick magneto part numbers on my engine? Trying to figure out impulse, retard, regular, etc...

66LR37SCNN
66LP-0SCNN

 

[aerhed]

66 is the base model. "L" is rotation. 37 is impulse lag. Don't remember the rest.