Just to add one more point - if you are replacing the lines rather than bleeding existing lines it can be significantly more tricky, as when trying to get fluid in for the first time it often wont draw straight into the master cylinder when you squeeze the lever, as air is so easily compressed and there is nothing but air initially in the lines. I get around this by using a dog urinary catheter (i'm a vet) & a syringe to inject fluid into the lines & caliper body before connecting the master cylinder & bleeding the system in the usual way, but you could use anything similar. And I agree HEL are excellent, had them make up a custom set for me & price/customer service was excellent, if I ever need hoses in the future I will go straight back to HEL.