Z1OwnersClub GB

Can somebody suggest/recommenced a suitable black tube/hose to use for the top carb vents on a 76 Z900A4? What I/D and O/D is used?

8mm OD x 5mm ID, 8x6 can be a bit loose but probably varies depending on hose used, fine if using a clip, it's also a bit more of a plastic type rather than soft rubber. Mine are about 400mm long which takes them to about 3/4 along the length of the silencer.

Thanks for the reply and link