What’s this bolt called?

03 Lincoln Town Car. Noticed a clicking in the passenger side front wheel under braking. Pulled off the wheel and the caliper is missing both top and bottom bolts. Napa can’t find the bolts I need so I’m gonna have to order them or go to a hardware store. 9/16 head with 5/16 thread. It’s not the main caliper bolt but it does hold the floating caliper to the pads. Any advice is greatly appreciated!!