Exterior Rearview Mirror problems of the 2007 GMC Sierra 1500

Driver's side rear view mirror doesn't have auto dim. N a trip and noticed passenger side mirror doesn't auto dim 04/18/07 and from then on had issue with mirror not auto dimming. Took to dealership 06/29/07 they said due to the vehicle build it is not equipped. So again driving at night on 07/04/07 had a problem with glare and distraction from vehicle lights behind me, shining in passenger side mirror. I have a dispute to make and I believe it is safety related. I have a 2007 GMC sierra crew cab with power folding turn signal indicator rear view mirrors. On the drivers side the glass auto dims, on the passenger side it does not. However it is to my belief gm has built these trucks this way to save money. I on the other hand feel that if they are going to have one side auto dim why shouldn't they have both sides auto dim, due to the fact drivers still get blindsided and distracted when there are bright lights shining on the passenger side mirror. I had a 2004 GMC sierra with both drivers side and passenger side mirrors that did auto dim. Many of the 2007 GMC sierra trucks are built this way and I feel that it is not safe to the driver, not only is it an annoyance, not only with a person such as myself has a sensitivity to bright lights and glare at night. I propose that gm be contacted about this issue and a recall be performed on these passenger side rearview mirror glass. Thank you .