Addition : 1987 740 sedan

OK, I removed the front spoiler and then unbolted the 2 side bolts on
each side holding the side bumpers on. The front bumper is now apart
from the side bumpers.

I unbolted the 2 bolts on each side holding the bumper posts in the
chassis

Now the bumper wiggles but cannot come loose. I looked around and
unscrewed a few screws on plastic housings, but why is this thing
stuck? Are the rubber mounts holding the bumper in the squares jammed
in there?

Any ideas what I am missing?  
Thanks,
Jamie