The part was modeled in 3D by Rich Brungard. The pilot is made to hold a 1015 coupler. If the rear tab is cut off it will slide over the front notch of a 1015 box.
In this example the side steps were filed off:
https://lh3.googleusercontent.com/-keJHcFpJDSU/Vo-uQgKKqRI/AAAAAAAAOow/aIbmenlWdMY/s800-Ic42/20151227_170557.jpg
https://lh3.googleusercontent.com/-eEj8b0ic7a0/Vo-uQ_nvk7I/AAAAAAAAOo4/M4iyjU50CEo/s800-Ic42/20151227_170621.jpg