I've discovered, at least when it come to the CB750K, that there are at least 2 types of grommets into which the tank badges push.
One is flat and slightly dished, (slides in behind the strip on the tank where the badge is attached) on my '76) the other more like a cup, (on my '72). I discovered the latter when digging the bondo out of my '72 tank, preparing it ready for a respray.
I'll see if I can find some pics for our edification...
