See
13H2934MS for original silicon type best seal available, which is Mini Spares own copy of the original Gaco seal that was discontinued. These were the seals used on production/rally /race cars that never gave problems.
This seal is the standard aftermarket item and adequate for standard use.
Fits every mini except automatic but in 1992 the factory replaced this with
LUF10005 which were meant to be more impregnable against crank pressure build up but racers still prefer our
13H2934MS. All are interchangeable. It is also worthwhile fitting the plastic protector shield
DAM2821 fitted as standard to engines with verto clutch.
a clutch tool
CE12 is recommended to fit seal without damage