I bought a UTV mirror off Amazon ...for inside...I installed it , drilled and bolted thru the front cage metal cross bracket , but the mirror was just a little to high up, it worked ok , so when I pulled my roof off to install the seal kit. I unbolted the factory bracket. Made a new 2" lower bracket, rebolted the factory bracket to my bracket...now I can see everything out the back. I don't have side mirrors , but with doors I would think the metal window frame uprights would be thick enough to drill and tap to get a couple threads there to bolt mirrors too.
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