Billet Specialties Valve Cover Hold Downs (2-7/8 Tall 1/4-20 Thread) From Billet Specialties #BSP 95011 Acorn Hold Down (4 Pack) / set Quantity:   Only  $31.95    #BSP 93013 Hex Hold Down (4 pack) / set Quantity:   Only  $21.95    #BSP 95012 Ribbed Hold Down (4 Pack) / set Quantity:   Only  $21.95