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I have bought this option on my last 3 BMW's so 5/6/8 series. It is available as an option in Australia across most of the BMW range. The factory tinted windows are installed on the rear and the rear side windows. For the front driver/passenger windows the factory glass tint is too dark to be legally installed in Australia (hopefully available in other countries). So it is then necessary to do the after market on the front windows. The after market has been allowed to go a little darker legally and so the match is now a lot better than it used to be. The factory quality is exceptional as it is baked into the glass as a process. As opposed to film being applied to the inside of the windows as part of an after market process, while very good these days is just not perfect.
For the 850 Coupe it would take a miracle worker to install after market film tinting on the inside of the large rear sloping window. The two smaller rear side windows would be no issue.
Hope this helps.
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