The PT-058 and PT-059 housings both use a 52mm thread.
The most popular lens for those housings is the Kraken KRL-02 Wide Angle Lens. A popular underwater wet lens that provides a sharp 165 degree fisheye image, and mounts on any standard 52mm.
You can find it here.
Another fairly new option is the Kraken 52mm air lens – KRL-11. It’s more affordable, smaller and still provides 33% wider FOV. Thanks to the single optical element, it is wider than other lenses which offer a 25% FOV.