Do these lens fit the Nikon D5000?

Http://opteka.com/opt65.aspx

You only need ONE fisheye lens.

If you buy the version of this lens for Nikon cameras, yes you can get one for your fine D5000

Do you see the little drop-down button? Click on it and choose Nikon

Have a look at Precision Design 0.25x Super AF Fisheye Lens

All glass lens elements; Exceptionally large depth of field
Reduces your lenses focal length by an amazing.25X; Offers attention-grabbing and distinctive perspectives
Optimized to work with almost any lens with a minimum focal length from 18mm to 50mm
Includes set of adapter rings to work with 52mm, 55mm, 58mm & 62mm filter diameters