I cut threads by hand with a tap, because you need the arms of King Kong to force those bolts to cold form threads
the factory screws are NOT "thread cutting" screws but thread forming screws...
they use a monster power driver (NOT an "impact gun") to run them in.
As an additional note there is another even nicer seat NOT on the list.
Explorer Sport seats from a 1990-93 Explorer sport.
these are NON power seats, power lumbar, adjustable thigh support,
POWER adjustable side bolsters, and the "thin" backrest like other
Gen2 Ranger highback seats, so they don't create a clearance issue
in standard cabs.
What's in my '87 Ranger Supercab?
You guessed it, the Explorer sport seats.
BTW, if you have an '89-92 STX you probably already have these seats.
AD