All-stainless valves were purchased on Amazon, and have 3/8 NPT threads on each side so they can be mated with AN-6 hardware (blue). These are beefier than the ones that came with the kit, and although they weigh more, they are easier to handle in flight, and have a larger interior diameter to minimize reductions in fuel flow.
The valve bodies had 'tabs' that I drilled out and tapped to 8-32, thereby allowing secure mounting to the 0.032" brackets I fabricated. I also shortened the arm on the left (pilot) side so it could be mounted further towards the rear. In its initial length, there would have been interference between the arm and the 2" torque tube. Moving it towards the rear allows a bit more flexibility in the bend of the tubing as it exits the cabin, just ahead of the valve.
Once installed I fabricated the left and right fuel tube 'elbows' that connect the valves with the aluminum fuel lines behind the door posts. Fabrication was complicated by a number of orthogonal bends to get around the fuselage bulkhead, but using a wire clothes hangar as a template helped ensure I got the right dimensions. I specifically wanted the AN connections to be in-line (to avoid 90 degree fittings - inferior flow than smooth bends), and visible/accessible for inspection/servicing.
