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I'm not 100% sure but on the earlier models (instruction manuals)it was sw12DE where the "E"= Electric Element. On the later ( newer) models I think they just add the "L" to the "E" for clarification. They just took the first 2 letters of the word Electric "EL"= Electric Element. If the "L" stood for somthing else I'm sure it would have been listed. That's my take on it anyway.
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2012 Silverado 3500HD|4x4|Crew Cab|long bed|Dually
2012 Montana 3750FL
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