Lorna,
There is no part number for the hydraulic hoses on your leveling jacks. They are just cut to length from large bulk rolls of hose and have the needed fittings installed. So a place like the one Fred suggested is a good option or remove the leaking hose and take it to a hydraulic shop and they can duplicate it with a new hose. The problem is that most of the time, it is too much trouble to remove the old hose, so a new hose is just ran a more accessible route and the old hose is just capped and left in place.
Gerald
