I went to Home Depot and got a few items for the upper flaps.
#8x32 12" Threaded Rod
#8x32 Machine Screw Nut
#8x32 Nylon Lock Nut
After experimenting the distance between the hinges I decided they should be 2" apart.
I also had to drill a separate hole in the Robart door hinge. First I used a 1/16 bit to create the pilot hole then I worked my way up to a 5/32 bit.
I removed the circular ball on one side of the push rod.
This is what my upper flap system looks like. I used the Nylon Lock Nut on outside and the Machine Screw Nut on the inside. I sandwiched the push rod in between 2 screws because it allows me to adjust the location later on.