I have to agree the cable should be available IF that is what is needed
A few years back I was able to get a shift cable for a MH on a 72 dodge M500 chassis new about $90
Now linkage rods should be able to find those from a wrecked truck
Or new thru a truck repair shop
Threaded rods, swivel universal ends etc..
This stuff all exists and can be used to fabricate a new part
i would not be spending the winter that way
i would put a hole in the floor and attach a makeshift shifter and drive out of there
they need to get a truck Mechanic/tranny guy to look at it (paid service call) so he can find the parts, they get towed to the shop and on the road again
explicit info on what is Broken could maybe be a help
I can explain it to you.
But I Can Not understand it for you !
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1997 F53 Bounder 36s