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Yes. Try to avoid the "chrome clad" wheels unless you really like them, but yes. 20" wheels are available.
The rear differential ratio you want may limit which wheel size you can get. You can't get 20" wheels with the 3.31 rear end. That's only 18"'s. You can get 18" or 20" wheels with the 3.55 rear end. If you jump to the 4.15 rear end I'm not sure what happens but I think you can still get 20" wheels with that.