> My tow-trucker-driver stepson thinks he might find such a thing handy in
> his toolkit and asks, "What other cars might this fit on?"

If there are many makes/models of vehicles with this 'condition', then I'm
surprised there is not a standard tow-driver kit with the different
sizes/threads.

Here is an eBay 'store' with some different versions, fancy ones with tapers
and knurled ends:

http://stores.ebay.com/reverselogiclimited

Regards,  Vern