Welcome to the forum.
Found a couple things when searching for "dimmer panel broken".
This looks like a pretty solid fix here.
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Actually your install looks innovative. Only suggestion would be to have used black hex head bolts instead of slotted screws for a slightly better cosmetic upgrade and possibly nylock nuts on the back to guarantee it will never come loose. Excellent idea, though. Went ahead and replaced with...
www.gmt400.com
This thread (solution) here may require the mounting posts to still be there and just split or something like that.
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Hi all, Replaced my headlight switch tonight, and somehow managed to finish off each of the 4 plastic posts that the screws go in to hold the headlight/dimmer assembly in place. I thought "Man! Now I've got to buy a new bezel, and figure out something quick in the meantime!" After thinking for...
www.gmt400.com
Here is another thread with some creative solutions.
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Fixing the headlight switch mounting problem (with remedies) I am going to try something with a bezel from a 1992 GMC. As 99.99999% of yall know these bezels had problems with the mounting screws holes with the headlight switch. They crack and the next time you turn on your headlights...
www.gmt400.com
Maybe there are better fixes out there and someone else will steer you in that direction.
Best of luck.