Hi, I have a 2005 KA 1.3 which is missing the rear sensor rings off the inside of the drum. I called ford and ordered two replacement rings but the ones that arrived appear to be too big. They are smooth and appear to be magnetic. I have checked on an older abs equipped fiesta with the same size drums and that has a bumpy (corrugated) sensor fitted which is the same size as I appear to need. Have ford given me the wrong part or is something amiss. At present the abs light is on due to no signal from the rear sensors. Will the old style ring fit my car or does the abs work differently on the later cars. There are 2 different electrical sensors listed for pre and post 2004. Any help gratefully received.