If you are sure that the boxes need to be changed and you are willing to, and know how, to change them I would look for a local shop that can make hydraulic hoses. Take one hose to them and ask if 1) do they have or can get the fittings on each end. If yes then 2) ask if they will make the boxes and pricing for doing the work. Explain to them what they are for and that you may be able to bring all hoses at one time or each hose as you can. Local shops will give you better quality complete hoses.
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