Long bolt looks like restraint system impact sensor retainer. Torx head bolt with thread lock secures the seat backs to the bases at the recline position, and the black push pin retains carpet/mats in various places to the floorboard or under the console.
Yup. I've seen it happen too many times. Caps were probably made from aluminum. The brass valve stems cause aluminum to oxidize at an extreme rate, seizing them on. I had a neighbor have the same thing happen to his garden hose. It had aluminum fittings, and they seized to the brass spigot...
The crank case vent tube connections using the orange clips are NOT reusable. They are removed by breaking off the black housing around the base, allowing the orange locking tabs to release. They must be replaced after removal.
I've got a set taken off a new 2023 OBX. they are boxed up and ready to ship, as well. I'm in NJ, so don't know if you want to travel that far. I could ship them if you wanted. Might be pricey, though.