The window mechanism went in our Viano and I was quoted £390 to replace it. £140 for the part and £150 to fit it. I know that it is cable operated and it sounded like that was what had gone. Currently servicing the regulators in our W116 450SE, which are built as though they could be fitted to a tank I was interested to see what a modern Mercedes was fitted. I decided to do it myself and looked on ebay for parts. Found exactly what I wanted even quoting the part number and giving a two year guarantee all for £28. Bought it to have a look thinking must be cheap for that price but no really well built. Took the original out and compared them and could not see any difference. The MB part had no identification on it exactly like the ebay one. Any way fitted it and so far it works perfectly. Obviously pleased with the saving but more to the point it leaves a big question unanswered.