Idk man. I dont remember having to take them out. I have end mirrors in mine. The stock one I remember having a time with. Had to use an impact screwdriver just to break the screws.

ProTaper SE Handlebar Jet Black KLX110/DRZ110 2176D BLACK https://www.amazon.com/dp/B009XIPUG4/ref=cm_sw_r_apan_i_9QD6W7VGG00ASSTMD0RJ

I have these on mine now. Have a couple different end set ups too.