This just came to mind. A source of Acme threaded rods may come from house jacks (for jacking sagging basement joists).

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

McMaster-Carr has Acme rod and nuts in a variety of sizes and materials.

If you search- ACME threaded Rod some also shows up on eBay.

Some also showed up when I searched Amazon.

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84 300D, 82 Volvo 244Gl Diesel

Closer to home, how about the threaded rod inside the factory jack?

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You can't always get what you want, but if you try sometime you just might find you get what you need.