Garage Roller Door

[steq184]

Having a single skin garage being built.
Either side of the garage door opening there are piers.
My question is how do I attach the new garage roller door. I was under the impression that the roller was fixed to the wall above the opening with A brackets.
My issue is that there’s going to be a metal box lintel.
Is there any other way to fix above door?

Thanks in advance

 

[oldbutnotdead]

Most roller doors the top roller is supported by the guide track - in your case you fix the track to the returns formed by the piers and hope your brickies were spot-on with vertical both sides.