I have had both 68 and 69 both had two mirrors. who cares anyway if youre driving the car like you should be put what ever mirrors you want on. It will only make a difference to the guy that dosent have a gto and probably never will. he has only read every book about them. cars are made to enjoy so put the sport mirrors on and enjoy them they look great. If you are wooried about it hurting the value unless you have a rare judge it will not matter much.If you notice most of those cars they are trying to sell for big bucks are listed for a long time. Remember when someone says this car is worth 40 grand hes full of sh** it isnt worth anything untill you have the money in your hand.