lilbowtie, question on the buckets in your Regal. Are those high-backs, or have a movable headrest like the later GN’s? If I can find seat cores, and the matching (or close) upholstery material, that’s a tempting option.
Those seats of his have movable headrests.
For your interior, 1984 seats would have matching pallex cloth as the rest of your car - same shade/pattern as 1983. The color, and material for that matter, changed for 1985.