PART NO.  SPL.PAGE  DESCRIPTION                                                           
AAA627    16.O.2    Pipe -connector to engine (flexible) -(oil gauge, instruments,
    std.model, 1600 and 1600-MK-II) -was 83866

AAA627 Pipe -connector to engine (flexible) -(oil gauge, instruments, std.model, 1600 and 1600-MK-II) -was part number 83866 for earlier models.

Alternate numbers:
Moss Motors USA part number 376-060
Moss Motors UK part number AAA627
Limora part number 19504

Mating thread for these parts is 1/8-BSP (28 threads per inch) The replacement hose from Moss Motors and Limora was reported to be faulty in October/November 2021, having incorrect thread that would not connect to the male threads on the mating fittings.

Another faulty hose shipped from Moss Mortors UK in June 2022.

See Faulty Parts report article at FT-110