I tore down my engine to replace the head gasket amongst other things. My brother in law busted two studs when removing the exhaust manifold. I had them extracted when I had the head resurfaced. Now I need to replace those two studs but can't find anything with specs and none of the auto parts stores around here have anything in their system for replacements. I really don't want to pull another bolt from the head. Does anyone know where I can order those or at least get the information to take to Tacoma Screw for replacements? Appreciate any and all help provided.