They have a ribbed rubber flange that measures about 1-5/8" across the opening

Chrome plated steel duplicate of OEM# 37065-06 used on 2006-up Dyna

Like ribbed

1979-up Shovelhead

M-5 Magneto for Alternator Big Twin Harley Davidsons 1993 - 1999 - Brushed Finish Cable Type_Throttle They have a ribbed rubberMorris M 5 Magneto for Alternator Big Twin Harley Davidsons 1993 1999 The Morris 5 series of impulse coupled magnetos offer incredible starts. Fully automatic and compatible with kick or electric start. Here's the secret to how they work A spring winds up, then at the proper retarded timing moment, spring is released and magneto blasts an incredibly hot spark for starting, no matter how slow the motor is turning. No returns are accepted on magnetos as