It's often easier and sometimes similar price to just replace the wheel hub assembly. It looks like the hub assembly is unique to the ST vs. base. Depending on the mileage of your car, getting a fresh bearing at the same time may qualify as preventative maintenance.
Rock auto has an AC Delco hub assembly/bearing part
https://www.rockauto.com/en/moreinfo.php?pk=14056761&cc=3298497&pt=1636
If you need one asap, you could try checking with local parts stores like NAPA.
Rock auto doesn't list a wheel stud for the FiST, which might suggest they're hard to find. You'd also have to find a locally shop to press the stud into the hub.