Set of 13 stair rods with fittings one of the parts of fittings is missing not the bracket but the part that screws in

The rods are different lengths due to curved stair case

See pictures

Missing piece picture 12

Sizes - 93cm 91cm 70cm 69.5cm 69cm 68cm 68cm 68.5cm 67.5cm 67cm 65cm 64cm