The hose in question , air supply for the air compressor , is only subject to boost air pressure from the intake manifold , and if it doesn't have special fittings a universal flex rad hose could be used .
If there are special fitting on the ends then a truck repair shop should be able to fabricate one.
Yellow box in this photo.
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.