This is a DDM Kit on a 2010 RT. I put the ballast's under the front upper trim panel. These are the 55 watt ballast, they are a little larger than the 35 watt ballast. They are secured with 3M automotive bodyside molding tape. I was surprised there was that much room above the windshield motor assembly. Good luck.
I discovered the same room and clearance at the Y frame junction just below the bright light access cap. Do not strap it close to the weld joint as it will rub the cap. Place it aft towards the shock about 1/2 inch. Luck.
I have 4 ballasts mounted under the dash of my '06 RT (2 low beam, 2 hella driving lights) anchored just in front of where the speakers would go (do not have the radio). Plenty of room, no issues in 4 years.
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