|S4LN-20 does not have impulse coupling. S4LN-21 does have impulse coupling.|
TCM NEW MAGNETOS S4LN 20(RH) /S4LN (LH)
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You are correct, only S4LN-21 has an impulse coupling. S4LN-20 does not.
Yes, these are new units priced as each.
Both mags are LEFT rotation, LH and RH are referring to which side of the engine they are installed.
This mag is not impluse coupled so one is not included. The impluse coupling is included with IC mags though.