Manufactured from the finest materials to exact specifications JIMS shafts have long been the choice of knowledgeable engine builders Note - Late style nuts with 3/4 in-20 threads, H-D# 24016-80, must be used on Late 81-Early 83 Big Twin models This product can be used with Model Part # Harley-Davidson Big Twin H-D#24006-58 58-72 PSHD-1 Harley-Davidson Big Twin H-D#24006-73 73-Early 81 PSHD-2 Harley-Davidson Big Twin H-D#24006-83 Late 81-86 PSHD-3 Harley-Davidson Big Twin H-D#24006-87 87-89 PSHD-4