I was too cheap to order the parts from Vans, so cut a 5.5" piece of 0.063 angle I had on hand (didn't have .032), and trimmed it per the picture. I used their diagram to drill the holes on both ends. I clecoed the piece in place on the inside and drilled four more evenly-spaced holes between the two end holes, deburred, dimpled, countersunk, and riveted with CCC-32 Cherry rivets. The bumps on each side flattened out nicely.