PRIMARY GEAR REAR BUSH TOP HAT TYPE

This is the top hat bush for all primary gears and is now silicon based to help lubrication of this dry running bush. Used in all our primary gears. For Cooper S or pre A plus 1275 type primary gears we also have a a replacement front bush in silicon based material that is free floating and a super upgrade. See C-AEA3240. running clearance finished size 1.503" +0.002"-0-0" for race 1 thou more clearance with plus 1 thou tolerance but never undersize as it needs running clearance.