Sorry Robert, no pictures, but I have installed T-Nuts on a couple smokers. Just pick the inside diameter you want (i.e. to fit 1 probe or 2). I ground off the flanges, secured it with a set collar. I also have bolts to screw into T-nut if I'm not using. The holes leak a minimal amount of smoke.
I can't make any comparisons with the guru eyelets. I used the T-nuts because no one from BBQ guru would ever respond to my queries about shipping the eyelets up to Canada. Good Luck!