Scully I think the nose of the Ultra Sport is to small for retracts. You need to get your fuel tank in there too and I don't see there being enough room .. You may be able to bash the kit ,deepen the fuse in the nose area so as to make room under the tank . But as I say I think the Plane flys so well built according to plans that I would leave it as is . The retracts are nothing but trouble . I my opinion .. I would save the retracts for something scale . Oh and just a tip .. I found that Pringles potato chip tubes are the perfect size for wheel wells ..