Have bought an L/R towbar from a breaker, and found that the two metal plates shown on page 4 (section 6) of the fitting instructions have not been included. Can't get much sense out of the breaker, so I thought I'd ask the experts. Are the metal plates a vital component, or can they be left off. I tried ringing my local L/R dealer and got very short shrift from them, being told that I can only buy the whole towbar unit or nothing - very helpful! Advice on this would be very helpful as I need to hook up my new (but old) horesebox trailer, and collect my alpacas from their summer shearing. Ta!