Well, after weeks of searching from here to Japan, my quest for a pair of original Nissan Patrol steering drag link dust boots (Nissan part 48522-44200) has led me to conclude that these parts have reached the mythical "unobtanium" status (unless/until Mike at Datsunlandsocal begins offering replicas of them

)
Luckily, I have landed on a fairly decent "2nd best" alternative - decent that is, if you don't mind using
Toyota parts on your Patrol...
Toyota 45457-60010 seems to be a good substitute -
CAM00789.jpg
It is a hair smaller in diameter than the Original Patrol boot, but it does stretch over the Patrol's drag link with a little persuasion (a benefit of it being a little snug is that it will hold the grease in really well

)
In place, I think only the most hawkeyed Patrol freaks will spot it's unoriginality - It even has a hole in the correct location for the grease zerk:
CAM00788.jpg
I added a record for it in the searchable parts database:
http://parts.60patrol.com/parts
Let me know what you all think...
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L-R:
White 65 Hardtop L60-3-00617 (undergoing restoration)
Red 65 hardtop 4L60-002565 (scrapped for parts)
66 Hardtop "El-Bondo Patrol", L60-00511 (Restored, then sold June2020)
Blue 67 Hardtop (sold March1997)
Green 62 Softtop L60-2-00504 (undergoing restoration)