Brake Reservoir hose ID

[Adam2201]

Has anyone ever had to replace the rubber hose from the brake reservoir to the rear master cylinder?  I noticed a bit of brake fluid on mine today - it could just be that the reservoir was just disturbed when I fitted my stainless hoses so I will check the clamps and have another look at it tomorrow, but since the rubber is likely to be original to the bike it can't be a bad idea to replace it at 17 years old, even if it's not under great pressure.


I wouldn't mind paying £10.00 for a Yamaha part from Fowlers or AJ Sutton, but as it's on special order from Japan, I'm wondering if anyone happens to know the internal diameter of the hose so I can just order a metre of rubber brake hose to cut down?


I'm guessing from the part number:


[color=rgb(154, 154, 154)]5DM-25895-00[/color]
 

it's 3/8 ID (9.5mm)?  the 5DM is the bike designation and the 258 seems to be 'brake hose' looking at similar parts?


Many thanks in advance.