At least I'd bet it is...
When removing my side windows to replace the jaw guides two weeks ago, I carefully laid the two side-by-side on the workbench noticing that my driver's door window was tinted while the passenger side window was not. My car did not come with the tinted window option ...great. That evening I posted in the Wanted to Buy section of the forum that I was interested in finding a non-tinted driver's door window. The next morning, member Urban Janssen (about 30 miles from me) texted stating "I have your window, call me". It ends up via a somewhat complicated story, he had a clear drivers side window installed in his car with the balance of his glass being tinted. After some discussion and several emails, we conducted an impromptu tech session yesterday at my house and made the swap. Aside from Urban's Antracite 280SL, four other owners attended making it six cars in all. Later on ...the "better halves" joined for us for dinner prepared by my wife Kenia.
What a great day!