Take a look at this website. Couple of years ago I purchased the 'sport ribs' and worked out well. Something to consider.
Website to 'ribs':
| Lazer Works - Engraving & Design | Radio Control Airplanes, Specialty, and More Look under 'misc'
Here's what they offer:
450 Midget Mustang
$93.00
(Original Race Wing Version)
$99.00
(Modified Sport Wing Version)
From Sig Kit Plans
Wingspan: 51 1/2 in.
.32 / .53 2-Stroke
4 Ch. Radio
Note: This particular parts file is for their original 450 Midget Mustang. It is an earlier version of the one that came out with the fiberglass fuselage. The one that we’re offering has a built up fuselage.
So, we're also offering 2 versions of the wing: the thin, race wing and a thicker, what we call a "sport" wing. It still builds on the same plans, but it has a thicker airfoil, making the airplane more fun to fly.