Thanks Bill, thats really kind of you to supply that breakdown.
Things have move on somewhat. ECS Tuning have come back and refused to tell me who is supplying them with their parts and have told me quote 'That part is shown in the system as being on Back Order. There are no alternative parts to order for it. Considering it is for an older Mercedes it may be months before we would receive the part."
I have told them to refund my money immediately and have politely suggested they change the way they do business. Probably wasted 3 or 4 hours of my time including the initial phone call in the middle of the night. Be careful of these guys if you are looking at buying part off them. Will be interesting to see how quickly or if I get my money back.
Thomas at MBUSA has been fantastic and has put me onto the fact that the backing plate was also used on 220b, 220Sb, 220SEb, 230S also have the same part. 1964-1967. So I am off to a couple of breaking yards in the upcoming days to see what I can find. I am picking the 230s is my best chance here.
Am sure the problem will resolve itself one way or another.