I think that is only available with the entire replacement spoiler assembly itself...that's one of the studs molded or secured into the bottom surface of the OEM spoiler part itself that is inserted through one of the trunk holes and is secured with a plastic wing nut I believe. Did you break one of those studs off your spoiler some how? You could probably use some high strength epoxy to glue it back into the spoiler if that's what happened. There's one stud on each end - see photo below.Sorry, for a 2016 Dodge Challenger. It’s the spoiler screw.
I have a spoiler already but it has different screws that won’t work with an oem spoiler. It’s an aftermarket that I have on right now.Are you adding this to a car that does not currently have a spoiler or are you swapping out one? If you are swapping maybe you can use one off your original.