If you that want close coupling action, you can use the original tank screw and put it in the countersunk hole, then drill the frame for the set of holes farther back, and you get this:
THE BUFFERS ARE SPRUNG!
I didn't know that until I installed it this way, but oh can forget about O40!
if you want to use the original configuration on O40, you have to trim the ears off the Kadee box, and it'll work no problem!
Thanks!