I am using Tygon brand from Mcmaster; not sure about the part numbers but I will look them up. I bought both supply hose from the tank and the little return hoses for the injectors. Both were relatively cheap and good quality (we use loads of Tygon hoses in the medical world). The ones I bought are rated for diesel fuel use.

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'98 E300 DT
'87 190D 2.5 turbo RIP
'92 S500 Sold
'03 3.2TL-S A-Spec