Wow! 900 miles! And it looks believable. (That said, at even that incredibly low mileage, the bumper fillers are discolored and look like they could crumble at any moment.) https://www.ebay.com/itm/113848010507
We’ve had a couple threads discussing the bumper fillers on this generation Riviera. Seems like most have disintegrated by now. If you are going to ask $35k, I would expect them to be excellent or replaced and paint matching.
Interesting collection. Looks like he has several nice GM’s there, and that one lowly ‘55 Fairlane in the lower corner.