When I pulled the trunk emblems from my '85 300SD they were both stuck on with the German equivalent of trim tape (super strong double stick) and some alignment pins. They were a stinker to remove. Mine bent a bit and I was able to pretty much straighten it w/o breakage. I suggest that you get a little trim tape (try your favorite body shop for a small quantity thereof) and straighten the emblem then stick it back on. It might not be perfect but should look OK.

The Tri-Star has a center stud and nut but I don't recall what keeps it from turning. I plan to install the Tri-Star in the center of the S-10 tailgate and I'll use trim tape in a couple of spots to anchor it.