Seems they removed that article when they redid their website.
Here's a copy from the way back machine:
https://web.archive.org/web/20150828213424/http://www.wrrdualsport.com/tech-guide/suspension/115-lowering-r2
And here's the original on thumpertalk: https://thumpertalk.com/forums/topic/536972-lowered-wr250r/