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This service .pdf indicates that you need 15x26x7 bearings. I did a quick search on Enduros website and they don't appear to make this size in ceramic.
A quick web search came up with one option that I could (quickly) find.
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Typically, in my experience, the bearing manufacturers are not going to say that they have a kit for a WTB LaserDisc Lite hub. They simply make bearings of a given size and if they are what you need, great.
What the .pdf doesn't specify is what size the freehub body bearings are. It gives a part number for replacement as a UNIT but does not break it down into its finer parts. Read further along in the .pdf and they do indicate that you can replace the bearings from the freehub quite easily. My recommendation is taking them out, measuring them w/ a vernier caliper and then doing a quick search to see if you can acquire a ceramic version.
Hopefully this helps a bit.