I would say that is less of an issue in a newish car , but if wanting a screen for an older classic , where originality is everything, then I would be looking for a genuine replacement, especially if they were trying to fob me off with laminated plastic instead of toughened glass as fitted up to the 1970’s .When I had my windscreen replaced on my 211 E55, I asked the Autoglass fitter about whether it would be an OEM screen or not.
He just said cars older than 3 years wouldn't get an OEM Mercedes screen and it was just what they fitted for this car where the spec was matching (i.e. it had the rain sensor).
To be fair, the one that was fitted was fine and I had no issues with the rain sensor in that car.
A couple of years back , I needed a screen for my R129 , rang Autoglass who had none in stock in the UK and couldn’t quote availability. I rang my insurer ( Privilege) who were really good when I explained the MOT was due in about three weeks and it would fail with a foot long crack coming down from the top of the screen , they told me if I could source one anywhere they would authorise it . I asked at the dealership and they were able to order it from Germany and got it within two days ( wasn’t cheap ) and I got a small independent fitter to fit it . I had to pay out upfront but they reimbursed me less my excess without any bother .
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