M actually is the luxury level. In WB M=Holden, N=Kingswood.
L = high comp 202, not 6cyl.
A is the model year, not year of build. A is 9/80 to 8/81.
L522651 is the PSN (plant sequence number which started arond 9/67), many get this wrong and say that the L5 bit is the production plant. This isn't always correct, from memory Elizabeth production ran into Perth PSN's before resetting to L1 so stating L6 is Perth is wrong as Elizabeth used the same code for a few vehicles (yet to be 100% confirmed).
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