Caterham 7 (DeDion with Watts Linkage) 7 Metric Chassis with DeDion & Watts Linkage (2006 on) DeDion "A" Frame Centre Bush - PF8-903BLK Vehicles up to 1996 use PF8-903, Vehicles after 1996 use PF8-907. This bush is suitable for Road and Black Series applications. - NOTE: Price is for CAR KIT, NOT per bush… Powerflex price their bushes individually, but we have combined the quantities to make it simple!