GM mini one wire alternator is 5 inches in length and 6 inches  In width, alternator has no markings on it whatsoever with the exception of a couple of letters. from my research, the alternator appears to be a one wire GM Chevy v8 35 amp racing alternator one wire. The Nut on the stud is a 10 mm nut. The alternator does charge and operates as it should alternator is in good condition. No corrosion, no cracks.  See, photos for verification.Alternator is sold as is no warranty.No returns