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I've wanted to change the seat bottom 6B18-6 from a curved piece to an angle so my two piece seat cushions would fit better. It would also allow for the use of a booster cushion under the seats if necessary.
Thought about using a hinge after cutting the seat bottom in two pieces, but the solution was much easier. On my XL the distance to the top of the rear gear channel is 147mm. After removing the seat bottom, I noticed the the midpoint on the curve was 140mm. The co-pilot seat hasn't seen any use.
Figured out that a bend of 115 degrees would allow me to use the same piece of metal without cutting. Used 140mm from the top edge as the bend point. This makes the bend directly above the back edge of the gear channel, 7mm clearance, more than enough for the rivet tails. Added a .020 doubler, 90mm x 420 mm, 45mm flanges, double row of A4 rivets with the same spacing as the seat bottom. Here's the finished product ready to be installed.