Hi All pretty new to C7 life - but enjoying it thoroughly even with all the issues ive ironed out on the car in the last 6 months....next - hopefully minor item is the central a frame joint a the rear i noted the poly disc/washers either side of the central joint seem to have worn through, are these an essential part, and if they are warn does it mean the bush is worn too? I presume the little poly washers can be picked up form caterham? anyone replaced these before and know what cause could be? Easy job but just checking no underlying bigger issue/job to do at same time. cheers