Thank you for the info!
Some of what you say matches the car, but some doesn't. Yes, the car is yellow. The top is currently black. That could easily have been changed by someone over the years as the top currently looks to be in very good shape, and I doubt that it's original.
The interior, though, is brown. Because not only the seats and carpeting are brown, but the door panels and the kick panels are also brown, it seems very unlikely that someone would have changed this car to this interior color scheme from something else. Here's a picture of the interior showing the top as well. I'm kinda glad it's not triple yellow. Any time you looked at the car, the glare would have been so overwhelming, you would have needed sunglasses, even at night!
Seriously, though, was yellow even an option for a convertible top on these cars? I thought it was pretty much white or black.
The car does have a rear seat radio speaker. There is no antenna at all, which is a bit odd. It doesn't even look like there ever was one as I don't see a hole in the rear fenders anywhere where it might have been. I do want to put one in, though, so knowing that it's supposed to go in the back and not in the front helps!
The seat belts are another issue as well. All that's left in the car are the two outboard retractors for the front seat. At some point in probably the distant past, the rear belts were cut off right at the attaching points. (Whoever did it probably took great delight in doing so. Otherwise, if you don't intend to use them and don't want to look at them, why not just push them down behind the seat?)
Anyway, I have been in contact with a fellow about getting original replacements, and based on my description and photos of what I have left of them, he says that they were, in fact, deluxe seat belts.
The inboard front belts appear to be missing altogether, and this is another little mystery. I assume that the front seat inner belts would have attached to the floor right behind the front seat, perhaps on the side of the transmission tunnel. But not only are they not there, I don't even see holes in the carpet where they might have been attached to the floor. Either I have to look harder for those holes, or the carpet was replaced in the past and the belts never replaced along with it following the same mentality that resulted in the rear belts being snipped off at the knees. I'm assuming/hoping that the attaching weld nuts are still there as I do certainly plan to replace the belts to make the car legal and safer to drive.
As far as the windshield goes, I guess it's tinted. It's actually in very good condition with no wiper scratches as you often see. In fact it's so good that, like the top, I wonder if it wasn't replaced at some point along the last 42 years. If it was, it's possible that a non-tinted one was used as the replacement.
I can't really think of any other unusual options. The car is rather minimally optioned to begin with. No A/C, which was probably not uncommon in convertibles back then, no cruise control, no clock, no power windows or seats, AM-only radio (which I don't think is original, based on what the seller told me, although it certainly looks correct). There is a switch on the dash for a power antenna, although, as I said, the antenna itself is missing.