You aren't really this helpless?
https://www.marlincrawler.com/differential/locker/detroit-locker
When it says meant to fit "1995-04 Tacoma, 1996-02 4Runner" and "2003+ 4Runner, 2005+ Tacoma, 2007+ FJ Cruiser" on the store page, I dont expect it to fit in a 4 Cylinder 8 inch diff for a 1985 Pickup. Either way, both of those are out of stock.
