Cutting off the crumpled ends of the Van's longerons, then adding an angle piece, doesn't address alignment issues in instances where both legs must nest against mounting surfaces. My solution was new .062x.75x.75 angle (order three extra lengths with your fuse kit, tell Van's to keep their junk). Cut to length, make two saw cuts in one leg (one must be a "v"), joggle, then rivet over the cuts in assembly a strap sawed out of .062 sheet with a very shallow "z" that follows the sawed leg.
Both sides of the longeron will nest against adjacent surfaces, through rivets securing longeron, strap, and mating part.
John Siebold