intake hose, where are you???

[SKEETR]

Had to replace a few hoses on the intake manifolds due to visible cracking at zip ties. Was able to cut a few down to size for replacements but I cant seem to find any at my local boat shops. It measures 5/16 od and 1/16 id. Runs from check valves on intake to bearing nipple and bypass covers. Would order it if I could determine a part number but brp list says n/a. 115 omc crossflow powerhead.