I can't help you with exactly what size you need. I made my brake bleeder out of a 2 liter soda bottle and clear vinyl tubing I bought at the local hardware store in the plumbing department. Punch 2 holes in the cap of the soda bottle, one to put the tubing in and the other for a vent. I do recall that I needed 2 different sizes for all the brakes I bleed through the years. You can either pull a bleeder screw to take with you to the hardware store or take the shotgun approach and buy a couple feet of several different sizes since vinyl tubing is dirt cheap.