Check with your local Suzuki dealer. They can usually order the parts in without issues. You might also check with your local tire dealership as they need to order replacement studs all the time. Napa or Autozone should even be able to pick up a set for you.
You can use studs off of a Geo Tracker/Suzuki Sidekick as well. The front studs are a touch longer then the rear but can also be used without issue.