Safari Mirrors

I just got a set of Quadratec "Safari Mirrors." Anyone use these things before? I'm curious how to keep them from swinging in at high way speeds or as I'm guessing, you just have to deal with it.

I bought them for use mostly so I can better see traffic in town when my doors are off.

I got mine at a local 4x4 shop but they were sold as safari mirrors. They have an "L" bracket that fits in the door hinges correct? If its the same thing, there is a jam nut on the top with lock washer as well as a nut and lock washer on the bottom. Tighten them up and they will hold. No movement up to 65mph so far. They do seem to transfer vibration as the mirrors will vibrate some. Not so much so as to completely blur things but it is noticeable. Went with them instead of the RR relocation brackets since the passenger mirror is all but useless when the doors are back on. If someone bumps into them they will move but haven't had any problems with wind moving them going down the road.