Success....they work great....can see behind me with ease..just the ends of my elbows visible in mirror now....a tad bit of vibration revving up thru gears but not enough to outway the positives
BUT...and there always is a BUT....
the mirror bolts were put in with the most potent loctite there is (blue loctite) and they were obviously never intended to be taken out again..So I tried just about everything on the first mirror till I finally got it out...I will cut to the chase and describe how I took the 2nd one out, which took me 5 minutes or less.
take of mirror assembly...put in vise...drill out bolt thru top, going down 3/16 to 1/4" deep..tap in square punch...twist...this will break/sheer off the top of the bolt (this is a good thing..you want it to do that) or you could just hit it with a hammer n flat head screw driver to brake it off..really soft cheap metal screws........... top mirror stem will come off then....catch it before it falls and breaks.
you will then have a 1/4 inch or so of bolt exposed that will still not back out even with clamped on vise grips (I tried)..you must heat it up to break the loctite bond..I used a torch for less than a minute...remaining bolt then extracts with ease.
(yes, I tried heating the bolt for a very very long time on top and bottom before doing any of this..it still just stripped out)
I went to Ace Hardware..bought 2 button head- M8X1.25 bolts...1" long..1 1/4 will work too..reinstalled mirror WITH mirror extenders.....
vise did scratch my paint a tad..touched it up with a can of black spraypaint a few minutes before reinstall
installed ..still have my denali's on mirror stems