Brake Shoe Hold Down Hardware

1968 Dodge Dart with 9 in. drum brakes.

The hardware kit for my drum brakes contains brake shoe hold down hardware consisting of a stepped spring and T-retainer as shown below. The retainer is slightly too wide to fit through the hole in the backing plate. I have discarded my original hold down pins, and I can't find any listing for pins for 9 in. brakes, so I need to use the new hardware.

My plan is to enlarge the backing plate holes slightly to accommodate the new hardware. Has anyone else had to make this modification?

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