My dealer sold me today some bulk hose for my 1987 300d, to replace the lines coming/going to the 1ry filter, i believe this is 7 or 7.5mm id hose, it only reads >NBR/CR< 28/02/41,but another piece i bought reads Are these different diameters? or different production dates? new vs old stock?
calling all hose Gurus..

A quick Google seems to indicate the NBR- Nitrile Rubber and the CR indicates Neoprene. This may indacat the inner part of the Hose is made of a different material than the outer part.
On the number???
American Hose has a date code on it but metric???

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84 300D, 82 Volvo 244Gl Diesel