For what it's worth, here's how we used to pick clips:
Get your cleat position down perfect. Then select a clip that leaves 2-3mm space between the tip of the shoe and the clip. You don't want the clip touching the toe box of the shoe. Like a poster said, bend them to fit. To move them away from the shoe some more, shim them out with washers between the pedal and the clip.
I wear 42 shoes and used to ride with large clips. But I also rode with my cleat all the way back, putting my toe further forward.
FWIW, I've found that T/Cs vary in size, both from maker to maker, and from alloy to steel...Christophe steel runs a tad smaller than MKS steel. MKS alloy runs smaller than MKS steel but larger than Campy alloy. Campy steel runs larger than Campy alloy but smaller than MKS steel...etc.
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