Got these to add as a visor mirror. They are thin and acceptable for occasional use. I don't know how they’ll hold up in the summer heat, but it does address the ”oh I forgot this car doesn't have a mirror” quip I get from the spouse. 
BBTO 9 Pieces Mirror Sheets... https://www.amazon.com/dp/B07173LNJ3?ref=yo_pop_ma_swf
BBTO 9 Pieces Mirror Sheets... https://www.amazon.com/dp/B07173LNJ3?ref=yo_pop_ma_swf
