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Does anyone know the correct numbered unit for an m38? I had someone offer me one in the metal case but there is no data with it and the only number on the case is h4-5-859 no voltage or anything else? thanks russ

The units are not vehicle specific. They are system voltage specific. 6/12/24 and they usually have their operating voltage marked on them. If you have the 24 volt model it will work.