If you have your mirrors adjusted correctly, you don't need those.
If your side mirrors are adjusted correctly, you CANNOT see your own car in them. To properly adjust your side mirrors - drivers side: Lean as far to the left as you can, then adjust the mirror so you can see down the side of your car. When you lean back to your normal position, you're looking into your blind spot, and the field of view should join, but not overlap, your center mirror. For the passenger side, lean to the right, and adjust the mirror in the same manner.
I have done this for years, and have absolutely no need for those little 'blind spot' mirrors. It doesn't ELIMINATE blind spots, but it sure helps. When someone approaches me on the highway in an adjacent lane, I can see them in my center, then side mirror, then my peripheral vision.
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2001 Boxster - Grey on Grey
1969 911T Targa - 'Stinky'
http://www.zoto.com/frayadjacent/img...f27a-4a399.jpg <---- my car. ^ crap I post.
"The existence of the flamethrower is evidence that someone, somewhere once said 'I want to set those people over there on fire, but I don't want to have to walk over there to do it.'"
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