3g Alternator which has the exact same mounting points as the ford 1g(small case). The ford 3g(small case) is used on newer mustangs and Tauras'. The nice thing about the 3g is that it puts out 130 amps, at idle it puts out 70 amps. I bought a new 1 wire unit from
http://www.paperformance.com/Scripts/default.asp