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That is probably correct but I just build it according to the idiot sheets. On that seat there is not any slot that shows where the harness threads through. Trying to get the pe flying wires and cross braces out of the fret is a challenge with out bending them though.Good stuff. Somehow I interpreted the Sutton harness to pass though a slot part way up the back rest but I can't find any reference to confirm that now.
Perhaps try annealing the connection points on the fret if possible with a small flame such as a candle or lighter. That should make the metal softer and easier to cut through. It will also bend easier, which I understand is undesired of course with the wires, but as long as it constrained to just the ends, they should be easy to straighten by gripping them flat with smooth jawed pliers. Just a thought and something to try if you were considering replacing them anyways.