Spares for Avid Juicy 3 disc brakes

[cycle cat]

Hello, does anyone know where I can buy some o rings for the fluid reservoir on the brake levers? I'm not after a complete service kit, just a couple of pairs of o rings.
We have two bikes fitted with these brakes. The seals have started to weep and I think it would be a good idea to bleed them.

I can find plenty of bleeding kits on the web. Does anyone know what type of brake fluid to use?

Thanks, CC.

[gregoryoftours]

The fluid you need should be marked on the lever reservoir cap - probably dot 4/5.1 (these are not interchangeable with dot 5)