Do a search here on the OS1.60FX,and on the Extra. Here is a pic of mine on the Sig Extra 300SX. Before you glue the stab, please check the incidence. Mine was off, and I had to sand the forward part of the saddle to get the incidence correct. Very Nice flying plane. I'm using an 18x6 prop. I use a Bisson muffler and a Perry VP 30 pump.