Rocker cover stud-sealing cone.
This seal sits on top of rocker cover and creates the seal between the rocker cover and the clamp washer when tightening down the rocker cover.

Engine fitment codes and year range
1.9 Diesel 09/90-06/03
2.4 Diesel 09/90-07/93
2.5 Petrol 11/90-07/94

1.9 requires 3 seals
2.4 & 2.5 requires 4 seals