Had bucket seats in duster out of a barracuda found correct buckets and went to install and mounting holes are different. Car orginally bench seat mounting holes forward to rear same distantance left to right new ones 12&1/2 should I use two outside holes in support brackets and measure in or is there away to detrime location leave for show in two days so any help would be appreciated.

Should be duster I know seat backs and covers were from 71 Duster. Thanks

Just redrill the 2 inner holes (If I remember correctly)

You need to drill 4 new holes per seat , the bench seat holes are not used . The floor pan should be dimpled where the holes go . Also don't forget to add the reinforcment plates to the inner holes.