The part numbers of this brake master are M390275, 4683264, 4863264, and etc... It is 15/16" bore diameter type. The outlet ports are 7/16-24" for the forward, and 1/16-24" for the rearward. The application summary of the aluminum brake master cylinder is Chrysler 1996-2000, Dodge 1996-2000, Plymouth 1996-2000.