If you talking funfly, and for the Razzle, the APC 14X4 W or if you have the clearance the 15X4 W. I fly the 14X4 W on my OS 91 Surpass and it's a perfect match, IMNSHO.
These are relativly new props in the line for APC, and some of the older LHS's don't show them in their catalog.
One quick call to APC will fix that.
Kinda spendy @$14.00 for the 14x4 but preformance is well worth it.

The thing to mention the the letter 'W' designation, it stands for wide