Might be a long shot but does anyone have a broken power seat they're willing to snip a pigtail connector from? It is the main power connector for power seats, circled in blue (not red) in the following picture:
It's a standalone connector that clips into the main yellow housing. There is a brown and red 12ga wire coming from it, as shown in the below pic:
Understandably local partouts don't want to hack up their own harnesses from functional seats.