You could use a "hat" portion from another vehicle that has it or brake hardware kit on the backside. If you replace the backing plate what I did on the fronts is drill a 1/4" hole where you want to cut, then cut through the center of the hole and use a 1/4" bolt and washers to put it back together.

If the bearing needs to come off anyway then it's no use cutting the plate.

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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)