The PE series comes in two different sizes.

Part number PE-1 uses standard type SF or SR drill bushings with a 1/2" O.D. X 1/2" long. Part number PE-2 uses 3/4" O.D. X 3/4" long bushings. Both pivot 180 degrees vertically at the end, and can be locked in to any position. They both have three slots to increase clamping positioning, may also be clamped down with c-clamps. This is the bar you'll need for the wings . surface not parallel, no problem.

That is if you have the is bar.