If you can't find a good one, I imagine a hydraulic hose shop could bend you a new one/copy it for not a whole lot of money. Some NAPAs used to do this kind of work.
Then again, here's a new one for ~$100.
Buy 1999-2003 Land Rover Discovery Power Steering Hose To Gear Eurospare for a low price of $109.73 at PartsGeek. FLAT RATE SHIPPING on most Eurospare QEP105481 orders.
www.partsgeek.com
Or a whole kit for less than $300.
Get all your Land Rover steering parts at Atlantic British. Here is the power steering hose kit for the Discovery Series II, 1999 - 2004.
www.roverparts.com
These are for D2s. Not sure about D1s.