For the '84 and '85 convertibles, Buick also added a headliner to the underside of the convertible top. Somewhere along the line I read or was told this was an "upgrade" insisted upon by Cadillac with the introduction of the Eldorado convertible in '84. This helps to reduce road noise inside the car with the top up. When looking for a nice example to add to your collection, this can be a desirable difference between the first two and last two model years. It is getting much harder to find well cared for Riviera convertibles for sale - especially by their original owners. I agree with Merrill, the prices for these cars are not what they should be, which means perhaps this is the time to try to acquire one. Most examples for sale have had or need a repaint, have or need a new top, or have issues with the bumper fillers. Finding one with low miles, original paint, original top, original (non-broken) bumper fillers, and ideally being sold by the original owner is nearly impossible but is the way to go if you can find one...