I recently took a couple pictures of two of the factory head gaskets (that may be all or there may be more.
The gasket on the left is from MB and points out the reinforced areas at the front. The gasket on the right is a factory MB gasket for a 1990 300CE 104 motor. Note it doesn't have those reinforcments but is the factory gasket.
Bosch Master, ASE Master, L1
33 years MB technician