727 flex plate sheild recommendations

I'm looking to get a flex plate sheild for my car I'm planning on racing it and want the extra safety. I bought a quick time one off summit and I'm either not seeing something or I got a messed up part. I'm not seeing how the holes line up. I'm wondering if any one knows a good sheild I can get that won't require me cutting the floor the make it fit. 73 Duster 360/727.

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