Here is a resin bench seat that you can use on the Revell/AMT Buick Regal, Grand National and 86/87 Monte Carlo kits or any other kits with similar style seat.
This will replace the front buckets for the original style 1 piece bench seat.
Resin Universal Front Bench Seat
As with many resins, you'll need to clean up any excess flash, pin holes and wash down with a good degreaser to remove any oils from the molds. Also before paint, check fitment as resin differs from plastic parts.