Gonna commit a little thread necromancy here, but wanted to share my findings for others in the US who might be looking for hoses that are as near to screen-accurate as possible.
This site sells 0.535" OD x 0.315" ID hose. Not EXACTLY screen-accurate, but really, really close to RafalFett's info on the original dimensions (0.55" OD and 0.32" ID). They sell it by the foot... so you only need to order as much as you need. And the hose wall is thinner than the stuff found at Home Depot or Lowe's, so it's significantly more flexible and less likely to pop off the connectors or catch on the flightsuit.