Here's a link to a purpose built protector for the Landcruiser/LX-470:
http://strongengineering.com/miva?/Merchan...Auto+Navigation
I've ordered 4, and they fit nicely and are hardly noticeable. They are a stiff plstic film, with adhesive around the edge only. The film has a nonreflective surface that matches the factory screen perfectly. Note that the product image is wrong... These do fit the LC/LX Nav screens.
This company makes VERY nicely fitted protectors for hundreds of products. I ordered them for almost every screen I own (cell phone, digital camera, PDA, etc). The protectors for my Nikon SLR are incredible. Custom fitted to protect BOTH lcd screens, down to every detail! Highly recommended.