The hose isn't available separately I don't believe, it's sold as an entire assembly and costs rather a lot. Plenty of people have replaced with fuel hose and injector grade clamps, don't know the Id/od of the fuel pipe needed though I'm afraid, maybe the op can help there.
Also, don't know if the op managed the job with the fuel rails left in place but removing them risks disturbing the fuel injector ORing seals which are also not sold separately. My fuel pipe was replaced under warranty and they ended up giving me a new injector as well since they buggered the ORing.