Rubber Washer - Rocker Cover - Mitsubishi Lancer Evolution 1 CD9A There are 14 of these on the rocker cover.
If you have oil around the bolts then these are likely to be perished.
Choose from RoadNutz Stainless or Genuine Mitsubishi Discount on buying a Full Set of RoadNutz Stainless Exploded Diagram HERE Mitsubishi Part Number MD327253 MD169784