The SAE variation of the Prusa Mendel is in a constant state of development, and that being true, Thingiverse is not the appropriate places to hold these files. Please go directly to the prusa mendel github at:

https://github.com/prusajr/PrusaMendel

I strongly suggest you follow the calibration routine Prusajr describes in this video:

http://www.youtube.com/watch?v=kwQzp2hvcBI

This will insure that your fasteners will fit correctly.

The overal instructions for Prusa Mendel are mostly static, but details change as you and others find new and better ways to do things. The instructions to construct both the metric and imperial instruction are at:

http://reprap.org/wiki/Prusa_Mendel

Some SAE specific instructions, such as a purchasing guide and rod cutting guide can be found here:

http://reprap.org/wiki/SAE_Prusa_Mendel

Any updates to the wiki should be done into the main Prusa site unless they are only relevant to SAE fasteners, in which case they should be done to the SAE page