NUT (manifold stud)......VOLVO(BRASS -- PV/P210 - B4B & B16)
STUD (manifold/head).....VOLVO(B16 -------------- 42mm Long)
STUD (UNC/UNC = BZP).....VOLVO(5/16" x 1 1/2" -------- 38mm)
STUD (UNC/UNC = BZP).....VOLVO(5/16" x 1 3/4" -------- 45mm)
STUD (UNC/UNC = BZP).....VOLVO(5/16" x 2" ------------ 50mm)