The jack needs to for a/from an ‘80-89 FMJ, only.
This jack is a representive picture only (I couldn’t find an actual picture)
Above info is from my '82 Dodoge Parts Manual.
’76-79 uses a bumper jack – that uses holes in the bumper to jack car up, with.
Pictures taken from my ’77 Volare Wagon.
I recommend going to a salvage yard or to a pull-a-part and looking for one from an ’80-89 M-body (5th Ave, Diplomat or Gran Fury – which are far more available than ’80 F’s or J bodies are) and that should get you going.
BudW