New heater matrix / heater core for 1970-1984 Minis. 2 plastic 5/8" outlets at each end  The later HIF38 1275 and single point cars had a change point where the plastic outlets exited on the l/h. These units take 5/8" heater hose,

Picture loos similar but end pipes are not together. They are at each end. 

New heater matrix / heater core for 1984-1991 Minis. 2 plastic 5/8" outlets at the same end and close together which exit the heater on the r/h side. The later HIF38 1275 and single point cars had a change point where the plastic outlets exited on the l/h. These units take 5/8" heater hose, therefore on cars pre 1989 where the pipe work is still 1/2" you will need to fit 5/8" hose pipe with a reducer MOC210 and then 1/2" hose as required.