1968 Barracuda bumper bolts

Hey guys - I've got my 1968 Barracuda off to paint and I'm going to replace the bumpers as well. Since I don't have access to the car, does anyone know what size the stainless steel capped bumper bolts are? Not sure what to order since I don't know the size. Thanks.
Here's the bolts you need.

Reputable source.

They also supply new bumpers

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