My seat cushions arrived today from Cleaveland Tool (seat cushion info is only on their old web site for now). I ordered them at Oshkosh last year, but asked them not to make them until this year, as I wanted to defer the expenditure. They look absolutely beautiful - I can't find a flaw anywhere.
I came close to putting the floor boards back in so I could install the seat backs and try out the cushions this evening. But I eventually calmed down and realized that it would just be a make work project, as I have some stuff I need to do under the floor, so the floor boards would have to come out again. Maybe this weekend I'll secure the wires under there, and put the floor back in.