Partner,
Put the part number in your browser. It will hit a bunch of places. But I would tell you to simply go to a hose shop, truck repair shop or anyplace that makes hoses, and have it fabbed up. I would get stainless steel braided hose. You will never again in your life, or your grandkids life, need to fool with it again. And it cant cost more than some of the places who MIGHT have it for sale. If you want it fast, get it fabbed.
The military had you make the line, it was not suposed to be orderable in one piece. The way to know that is to look in TM 9-6115-584-24P, Figure 17, for the hose. The SMR code for the hose assy. was MOOO. That means order the hose, and separately the fittings, to be assembled by Organizational Maintenance Personnel. Having said that, I once ordered it by part number, and got it. But had to wait forty forevers.
Do you have the TM's for the gen set? If not, they are in the TM section here in SS.