ok mine measures differnt and looks dffernt this is spossed to be 75amps has double pulley has 1heavy wire and 2 smaller wires (was part of a pig tail left from where junkyard cut it) there is no box on back back looks bout like he front the bolt spacing is 7 inches im gonna make a alum mount out some 1/2 plate and bolt it on the 2 bottom timming chain cover bolts on he passenger side