What are the threads on the cortina m16 calipers for the brake lines and same with the rear capri 9" drums.

are they 3/8" UNF or M10x1 ?

Tried a search but no joy.

Cheers

IIRC the Cortina calipers are 10 mm , not sure about the rear wheel cylinders so would suggest try a 10mm brake pipe nut in the threads.