The order of parts you have listed is correct, don't forget the anti rotation pin at the thrust washer.
The reason the anti-rotation tab is there, if for some reason the force to rotation the bearing exceeded that of the bearing 'basket' the basket would start to spin, and destrtoy itself in short time, the short answer is that the tab really should have been built into the dual case kit, but in your situation, looks like grinding it off is in order, that or have a machine shop put a notch in there if material will allow.