FJ Centerboard Stopper $7.35 Rubber stopper for top of CFJ centerboard, two per board. LP Part # 85023
C420/FJ Rudder Pivot Bolt Bushing $4.95 Rudder Pivot Bolt Bushing for the FJ and 420. It might be white inside your rudder blade, but this black one will work. Might have to cut down a bit if too long.
