Should be an easy job to remove and install. The auto dimming will darken the mirror automatically when the cars behind you or on the side is too bright or with high bean as well as cars from opposite direction with to bright headlight or high bean. It will then clears back to normal when the brightness reduce from cars in front or behind automatically.
Good Luck and thanks for looking. The item "FACTORY OEM 97 98 99 00 01 02 03 PONTIAC GRAN PRIX AUTO DIM REAR VIEW MIRROR" is in sale since Tuesday, April 14, 2020. This item is in the category "eBay Motors\Parts & Accessories\Car & Truck Parts\Interior\Mirrors". The seller is "auctiondealonline" and is located in Sunnyvale, California.
This item can be shipped worldwide.