I had to modify one of these to get it out of the car and attached to the roll bar at the same time but it works great.

Longacre Mirror
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I also tried one of these on each side of the car, no matter what I did, even after a good amount of modification to the mount and talking to a couple shops, my cage design simply did work with these mirrors. I messed around for 2 weeks trying to get them to fit right.They are great if you can get them to fit on your cage. I already ebay'd the ones I had.