E Class deflector

[Legcutter]

Just upgraded my E Class convertible to 2018 350. I had a wind deflector in my earlier e class which fit behind the seafront seat and was very effective. Looking at e class reviews on U Tube I thought the deflector was standard but it is not. You can buy the deflector as a genuine Merc part but my local dealer has quoted me an outlandish figure to fit it. Anyone any information or experience regarding this subject.