If it is not bent up real bad you can try this trick I use for stainless steel trim. Take a plastic bowl and cut it so you can set the grill bar it to it fill it wth cheap bondo and set a undamaged section of the trim into it with a very light coat of grease on it. when it hardens you can beat the dent out into the mold. You might need to reshape a hammer or two for this. The hammer shape should have a slightly smaller radius than the part or to say it another way the hammer should have very close to the same shape as what you want to form. You might be surprised how hard you can hit into this. Be advised bondo in a bowl WILL GET HOT !! Good luck Ray