For the record, on these models* if one cuts away the bottom corners of the Kato pilot opening to fit a 1015 box, then the coupler ends up approximately 0.009" too low, which is literally the difference I just measured between the thicknesses of the 1015 and 2004 box lids, the latter being thinner. Also the Kato clip won't go in all the way, so now you have to carefully tap and screw without penetrating the walkway above. So if you go that route, you'd need an entirely different essay from Bob on how to raise coupler height, which might not be possible without destroying pilot detail above the coupler. But you can avoid all that by following the earlier posts in this thread.
*applies to the SD70MAC, SD70Ace, SD70Ms, ES44s, and I'm sure some others produced since about 2005.