Before the days of Aeroquip, Minis were fitted with braided steel rubber fuel lines. They should be used in place of rubber for all fuel lines in the engine compartment. They come made to length, with rubber end caps.
If you need the 5/16"bore size for the twin rear tanks joining pipe see
21A2332.
This is the shortest in this range of hoses up to PPK7 which is the longest.
Orange band denotes- Made to specification to cope with modern ethanol bsed petrol.