When I built My +8 Bitsa I needed rear wings. Lorne Goldman sent Me His old front wings. I was able to get one rear wing from a Local Friend (new) for $50, but that left Me with one to get. I had a +4 rear wing that I added metal to but that was a bodge. Cuthbert Twillie lent Me Molds for +4 rear wings. It looked like I would be able to modify these molds for a +8. It never got done as I felt the cost/time/uncertainty was too much. So I bought a rear wing from Uncle Mel. Rutter's price was not too prohibitive but the cost of air freight to Seattle was huge. It made Me wish I had spent more time on Glas Rear Wings.