12a rotor housing
welcome to the board. 
generally speaking, they can be interchanged. however, if you have emission to contend with where you are, then it may not be simply a matter of putting an engine together with whatever housings you have at hand.
generally speaking, they can be interchanged. however, if you have emission to contend with where you are, then it may not be simply a matter of putting an engine together with whatever housings you have at hand.
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