Product details:

Comet 108-EXP Clutch - 30mm 1:7.5 Tapered - Designed for more power, more endurance, more of everything you need for speed - and now accept OEM starter rings for electric starters. Tried, tested and built to handle high-horsepower engines. Consistently smooth shifting even after hours of use. Wider rollers for increased bearing area (33% more). 1997 and newer 108-EXP clutches include special recessed mounting bolt with special pilot washer. Each features a bushing in the movable face and redesigned fixed face for increased durability. Uncalibrated clutches are sold without cam arms and spring. NOTE: 108-EXP clutches use the same cam arms and spring as the 108-C. NOTE: A flush bore depth indicates the taper begins exactly at the inner edge of the fixed face casting.Positive (+) numbers indicate the taper starts the specified distance into the casting; while negative (-)numbers indicate the taper begins in an extension out of the fixed face casting.