RE: Sullivan Tailwheel Attatching to a Sig Somethin Extra
An APC 12.25 x 3.75 with a 46 works very nice. Ya gotta pay close attention to prop tip clearance with the Sullivan TW - like Tall Paul said - might look to a taller LG. I'm thinking that I used a SIG Kadet Senior piece on one and a Dubro composite on another.
You'll have a ton of fun with that SSE! Enjoy it.