"Balmar 2.4"" Diameter, 1/2"" Belt Width, Dual Groove 95/97/98 Series Alternator Pulley . 95 98 Series alternator pulleys are machined for use with Balmar large and X-large case 95-98 Series high-output alternators with 7/8"" shaft bore. All pulleys are keyed. Bore: 0.875"""