My 1999, C280 sport had lightly tinted rear and rear side windows. Was this something that came from the factory or was this done by an aftermarket shop?

I am wanting to know because the C43 I just bought has no tinting on the window at all and I would like to have the rear window and rear side windows tinted.

But I do not want to deal with a flim that had bubbles or other imperfections that make the tinting look like a slab of plastic draped on the glass.

My old C280 windows looked like the tinting was a part of the window.

Jeff