This billet aluminium replacement bracket is a oem copy of the original Ford alternator bracket used on the 302 Windsor with the water pump inlet on the left hand side. Same as D0OE-10A336 AA , D1OE-10A336 AA This bracket mounts to cylinder head to allow main alternator bolt to screw in. This bracket was used on all Ford XY 302 Windsor vehicles as well as many US cars of similar era.