Cork tappet chest cover gasket for 850-1098 engines and Cooper S up until 1966. Sold each, two (2) required. Ref: 12A1139, CKS809, 12A1139B.
Also check 12A1176 seal and 12A1177 cup washer for the tappet cover bolts when doing this job.
1966-on classic Mini tappet chest covers used the 12A1175 rubber gasket.
valve cover gasket, see GUG32VC. While these two gaskets are made of the same material (cork) and are similar in shape, they are not interchangable!
Important: If you are looking for a