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Both the Engine and Transmission plugs are the same and they can be used from approximately 1980's to present day 2012 models, using the popular SS 1/2"X20X1/2" thread size. 1999 low riders and all Sportsters don't have a drain plug because they have a tube to drain the oil.

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Q: What size is the engine oil drain plug on a 92 harley softail custom?
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