Side Trim Install

[gregbr]

Has anybody installed new upper trim? I'm installing new trim on the newly painted truck, it has new bedsides, so I have to drill those holes yet. The problem is, the trim on the original doors and front fenders lines up OK, but when I mark the holes on the new bedsides the same as the old bedsides, the trim runs downhill from the rear of the cab to the rear of the bed at the top of the taillights. It looks really crappy when you look down the side of the truck from the front or rear. The trim holes are 8" down from the top of the bed at the cab, then 9" down from the top of the bed at the rear near the taillights. Do I have to pull a string all the way down the truck and files the holes or what am I missing. Greg