They are still here on thingiverse, they were just different "things". I am just trying to move all the standard parts into one "thing".
This has evolved over the last year and we were trying out different parts. Now with the new parts coming out all the parts will be in the same "thing" so I don't have to maintain a recommended list.
This page should have everything you need to know. http://www.vicious1.com/blog/parts/