Wanted: one Kelsey Hayes caliper mtg bolt

I need a single K/H, for A-body, caliper mounting bolt. The 7/16 X 1-7/8 one like the photo below. I guess one of mine evaporated over the winter. Or there was one wrong bolt in them when I took them apart and I didn't notice at the time. I've been from end to end in the garage a couple of times with no luck so I'm hoping someone has one extra. Help please!!

Thanks!