glass

Hi all, What are the criteria behind selection of the colour of glass for your E9? Is it the same us interior / upholstery? You check your model and the year of the production, you look at the table and know that the specific car, painted in specific colour should have specific interior...

My front door window regulators don't hold tight to the bottom of the window glass, and separate if pressure isn't applied to the top of the window when rolling down. What works well to give the window lift some grip on the glass?