Type2 Bay T25 type4 Pushrod Tube Seal (Small) 021109345-A
These fit on the engine block end of the pushrod tube and are as fitted to the 1700cc, 
1800c and 2000cc Type 4 engines. 
They are suitable for 1700cc, 1800cc and 2000cc T2 Bay (1971–1979); 
and 2000cc T25, 1979–1983. 
Sold singly, you'll need eight of these