67-69 Barracuda Aftermarket Bumper Recommendation?

What size bolt for the bumper bracket to body? Is the stainless capped bumper bolt 3/8 or 7/16? thanks for the help, just want to do it correctly-

Heres the correct bumper bolt

OER Zinc Plated Bumper Bolt With 7/8" Flat Stainless Capped Head - 3/8"-16 X 1" Bumper Bolt With Nut MN1700 | Moparts