you could use a coat hanger and some expoxy... just paint the coat hanger black to match the grill, then glue the gts lettering to the coat hangers(on train tracks) then glue it to your grill... (its plastic so hot glue or sodering aint gonna work that well)
Use the 3m double sided molding tape (gray foam stuff) it works great, just don't forget to put a piece behind the mesh, and through the holes (so it sticks to the tape on the emblem) It will not fall off if the surfaces are cleaned with rubbing alcohol first.
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