Perhaps you could post a photo of the line you need. I just completed a Re-Hose of this one a friend asked me to make up........
Had to modify the hardline with a flare to accept a Male Fitting and then make up a new E-85 rated hose to connect the two parts.
I am not very familiar with the hoses for a 928, but I think this is the supply hose to the FPR that then connects to the fuel rails.
Len at Autosportengineering dot com