It could be to do with the manufacture time. When Arch made early chassis - before 2001 - the powdercoating was pretty good. There were then a few years when the coating didn't do so well and flaked/rusted. Your car/chassis may be one that lasted better - or may have been refinished at some time. The deDion is definitely newer than the car, so may be from the 'dubious' era, or could have come from a completely different car. A small concern is that your car would probably have originally had a dedion with the shock mounting through the tube instead of under it. If that is the case and you are on your original shocks, then they may not have the travel they should have. Alternatively, the shocks may have been changed when the deDion was. Re: JKs comment above - the wire in the brake pad is a depth sensor. Many pads being sold these days have the wear sensor built in, but not used in the Caterham fitment. The wire can be cut away, where it enters the side of the pad material. However, it it doesn't enter the pad, then it may be a wheel speed sensor. The pad wear wiring tends to be very short and wouldn't reach along the wishbone. A speed sensor may be behind the caliper - it would normally be mounted so that it nearly touches the heads of the bolts on the back of the disc - it counts the bolts as they past and sends a signal to a speedometer. There may have been a bike speedo on your car at some point. Cheers - Simon