RE: Dynaflite Bobcat Brushless electric conversion
The folding props for the brushed motors will work just as well on the brushless. You just need to make sure you get the right size prop. Hobby Lobby sells the Graupner folding props in a wide range of sizes. You'll easily find one.
Stick with one of the outrunners that has a lower Kv rating so it can spin a larger prop.