Reply From: OSIAS Autoparts Inc
Fits well on my 25 gmc sierra 1500. I did not have to use any additional brackets on rear of bed. You need to just line the cover up, center it and unfold it. I had a bed arm to assist in getting into bed. It fits with it. No need to remove. The multi gate works well with cover too

The last section latches need to be slightly forward to latch due to body design of GMC. See pics. Didn’t need to drill for gmc mounting brackets. The cover fits without them.

I got inside bed and did not see any daylight from cover. I feel it will keep water out well. Hoping no fade or issues as it seems to be worth the money. Happy overall and would purchase again.