In the 1990s, Cooper models with HIF44 carbs were fitted with a slightly different mechanical fuel pump. Genuine SU. Ref: AZX1817, GRN035748.
Spacer/insulator AUB5040 may be required.
Use AZX1818 for all classic Mini models pre-1990, and WND10005 for models after 1990 with HIF38 carb.