I just clicked the link and there are three in stock. Aren’t these actually threaded on the end? Not to be infinitely adjustable like the old 617 ones, but just as a means of affixing the end…?

Lots of different ones in stock on eBay used from time to time. Different lengths but cut down and cut threads is viable.

__________________
Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (116k)
1991 350SD (206k)
1991 300D (228k)
2008 ML320 CDI (199k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (267k)

Past Diesels:
1983 300D (228K), 1985 300D (233K), 1993 300D 2.5T (338k), 1993 300SD (291k)