Ok, try hobbyking. I have the blue 31mm and 34mm and the props are wider blade and for the 1/8" drive, just use a brass tubing cutthe lenght to 5/16 long and slide into core of blue prop and onto shaft. No need to balance or sharpen. Get a few of them to try and go from there. Hope this helps. The sizes you typed are alittle flimsy. Try the blue 31mm first as you are close to HK. Brass tubing is 1/8". Tubing comes in 12" pieces.