By the color of the wire retainer on the module. The "common" one for 1979 -- 49 states and Canada had the blue retainer. NAPA Echlin #TP40 or Standard (Blue Streak) #LX203
I'll attach a picture.
There was also a design change that eliminated one wire from the original design, so don't be concerned with that.
Design Change Info
http://repairguide.autozone.com/znetrgs/repair_guide_content/en_us/images/0900c152/80/04/bb/a3/large/0900c1528004bba3.gif
http://eaccess.smpcorp.com/eCatalogs/Downloads/EMD/693126.pdf
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