Premium Febi Bilstein 12 mm X 120 mm XZN 12 Point Cylinder Head Bolt for 1973 - 1993 Mercedes 190, 240, 280, 300, 615 990 02 12
"Using new head bolts when performing a cylinder head installation is always a good idea however, on late-model engines that came from the factory with TTY (torque-to yield) head bolts, replacement is an absolute necessity. TTY bolts are designed to exert the maximum clamping force for a tight head gasket seal, however they permanently stretch and could fail if re-used."
This is an M12 X 1.5 X 120 mm 12 point XZN later style cylinder head bolt.
Depending on year and model the quantity needed varies.
These will fit select models of the 1973 thru 1993 Mercedes 190, 240, 280 and 300 engines, PLEASE see the application fitment table to verify fit and quantity used.