Thank you, Joe - you have a PM.

NachoRT74 and 72roadrunnergtx: Thanks for the additional info. I've gone through all my pics, and can't find one of the back side of the cluster. I also can't believe I never noticed this when I had everything apart. I *assumed* the cluster was only held in by the four screws near the top (should have known, that didn't seem like enough). I found a pic online (below) and I think these are the two tabs that are resting up against those two holes I showed in my earlier pic. Unfortunately, there are no u-nuts on them, and I really don't want to pull everything back out to put them on. Instead, I'm going to devise a simple fix, which I will post when it's done. Thanks again!