I have a Red 2014 Leaf and the seat has two handles on the left side. One for height and the other, a smaller one, for the seat back adjustment. The forward backward adjust is a pull bar at the lower front of the seat. I'm curious to see if the bolt and washer modification would help any but I'd really rather just change the whole seat out. I concur that the price of the extension brackets is unreasonably steep. In the end I'll likely just leave it alone and suffer along until one of the Ice buckets dies and then go looking for another Electric that fits.
Zurc.