928 106 197 03S - Water Bridge Flange Gasket ROW 84-86
Water Bridge Flange gasket ROW 84 to 86 - Silicone.
No longer Available from Porsche
Technically these gaskets were only used on the S2 ROW 16v. However earlier cars have been found to use them as well.
If your water bridge has a deep groove for the seal this is the one you need.
Vehicle pictures curtesy of James Crown 1985 S2