when buying rubber hose, it is slightly smaller in id than the nipple size it's for.
so 1/8" rubber hose will have a slightly smaller id than .125.
7/64 hose may, or may not fit, depending on how flexible it is. if it's cheap hose [insert your country of origin choice here] it could possibly split when installing on a 1/8" barb.
how much do you need ?
i may have some in my stash with the two ribs, but i would have to look.