If you want to stick to factory buckets, you will need em complete with mounting rails, but the stock buckets are damn uncomfortable, more like those seats you sit on in school!
for an easy fit, look in the import section of your local wreckers
I got a pair of Accura Type R buckets, so comfortable with lumbar support, reclining backs, seat bottom adjustable & the seat mount rails fit the early Fairlane, with just one bolt hole to drill. (fr.driver side)
I did switch out the oval shaped doughnut style head rests for the much smaller honda Civis, slip right in orig, holes.
the scale of them fits the car perfectly, & i;ve had lots of people ask what aftermarket company they came from.
If you get real lucky you might even find em in your color
All for 45 bucks!