If you carefully remove about a 1/4" semi-circle from each side of the
grill, you create a space where you can use a flat bladed screwdriver to
spring the push pins loose, thus avoiding the need for possibly damaging
brute force.  An electric drill held sideways to the grill makes a nice
cutting substitute if you don't have a dremel tool handy.  The new holes are
not noticeable unless you get very close to the grill, so appearance is not
compromised.

BTW, new lights, wires, and relays make an extraordinary improvement over
the factory setup.

Budd Premack
91 GL
86 Syncro
Land of Sky-Blue Waters