Disc brake hoses don't fit frame brackets. Grind which one?

I just got new front brake hoses for my '72 Dart which now has '73-up disc brakes. I did request hoses for a '73 and they fit the calipers & banjo bolts, clear the suspension, etc.

But the chassis end of the hoses won't go through the mounting tabs so I can install the retaining clips, because the hose end is round and the bracket has a flat on the outside parallel to the frame rail.

It seems to me that the point of the flat is to keep the hose from twisting (when the wheels are turned) which would allow a twisting strain on the stationary steel hardline. So I'm thinking of filing a flat on the female hose end.

Could I have bought the wrong hose? Thoughts on modifying anything?
thanks
Charles