Gas tank filler neck for diesel

[1967KaiserM715]

Went to go put some diesel in my truck, and found none of the diesel nozzles would fit in the fuel tank filler. I had read somewhere that all the trucks used the same neck, but some were equipped with an extra large spout (namely a lot of the CUCV trucks), so I am wondering if any of the new filler necks would work, or if I need to find a set of used necks. Most places seem to sell only one neck for 84-87 (91) but they don't say if it would be compatible with a diesel nozzle. Any help is appreciated.

PS, I could fill the tank, I put in 6 gallons on about a half a tank, only took me 15 minutes, because I could only drizzle it in.

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