Needs bumper fillers and rear glass https://miami.craigslist.org/mdc/cto/d/minneapolis-1974-buick-lesabra-luxus/6837742282.html
In other words it needs a rag. The backlight is laminated to the top, it can't just be "replaced", the whole curtain holding it in has to come out. This was a big problem with that design, if the arms go out of whack or are not lubricated properly, the top retracts funny and loads up the glass which blows it out. Don't ask me how I know. Otherwise, this thing would be a good starter car for someone getting into the hobby, it looks like there's a lot there for $5K.
If it is as nice as it looks, that is a good price. Though it's missing its bumper filler in addition. To the back window. Which is not unusual. But it helps with the price.
Wonder how much rust it has, you can clearly see some in the picture of the wheel, I am betting a fair amount