Windage Tray and Main Bearing Cap Fasteners

I don't have a history of this engine running so I'm unsure of the running condition of the factory fasteners. If I'm going to throw $3k+ in my short block, I would like to have fresh fasteners that are not fatigued.
It sounds like studs are the way to go with a 12 point nut under the oil pump- does anyone know the PN for that nut?