Application.
Special Plug Bolt of M16 x P1.5.
If you want use for the oil cooler sandwich block, please buying 2 bolts.
Size(Approx):
Bolt
Whole length:17mm.
Bolt head:22mm-Round.
Bolt head hight:5mm.
Thread length:12mm.(Butom to Bolt head.)
Thread:M16-P1.5.
O-Ring
OD:18.9mm
ID:13.8mm
Thickness:1.5mm
Specification Number: DIN 3869 #16
Seem to be similar to The BMW Drain Filler Plug Seal Gasket Ring.