You should be able to get what you want done with a quart easily and then some. I would use clear coat as well just because the rest of your paint has that and it will help your paint last longer. After you have your lid and grill painted have the shop put the left over paint in a bottle for you and there will be a pint or more left, use that and a brush for more accurate touch ups down the line. You can be sure that whatever paint you chose there will be a slight differance in color just because of fade from sunlight. GL on your paint job.