I had used the bottom brackets. I put a small washer on the bottom of the bottom 2 bolts as they would just eventually turn without tightening and I noticed they weren't overly tight and not quite the same amount of threads on showing. I wasn't able to use the top brackets but pulled the screws out as it was forcing them in different directions. That seemed to do the trick. Even with the D2H bulbs I think when it warms up I will pull the caps off, heat and stretch them as I feel they should be pointed up higher, but the adjuster is getting pretty tight. It is on a 3/4 ton so they do sit ass up compared to a half ton.