Interesting note on the esky end vents. I put them on my 2006 Denali XL. Theres no hump @ the top of the vent that you mentioned.
I guess it would more of a bump out than a hump. Hard to describe. I had a set of Esky ones on mine and it just wasn't a smooth transition from the Yukon 3rd brake housing housing to the Esky vent. Both sides were like that...hmm..maybe I got a bad set...but I believe the Esky 3rd housing does bump out a bit. Another member made the same remarks...I'll have to look. But at any rate....minor details...mainly for the OCD people like myself.
@Bigbeardenali1992