I'm guessing the hose on these cars is very similar to the one on my 85 300TD. If so, it can be replaced with ordinary high pressure hydraulic hose, reusing the original fittings using the procedure outlined in this thread:

Repairing hydraulic hose for SLS hydropneumatic suspension on TD

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13