The middle bracket does not have the bend because the gutter is arched and not all vans are the same. If the middle bracket was also bent to carry the awning, the awning would likely either not rest on it or would teeter/pivot on it negating the load being carried by the two outer brackets.
You may have pop top clearance issues on the backside of the brackets if you mount the Fiamma brackets to the Z Brackets.
Beastie 3: 2002 7.3 EB Cargo: Agile TTB, CCV High Top, Custom Walk Through, Lots of stuff added. www.BlingMyRig.com