As Peter said, you will need to use the anatomical dataset you used with @auto_tlrc to generate your standard space dataset. If you do that, then the approach you show should work well. If you have transformed your data using another method, you can still accomplish the transformation from standard space back to the original native space using some other methods. Take a look at this previous thread and some our class documentation.
http://afni.nimh.nih.gov/afni/community/board/read.php?1,82828,82832#msg-82832
Slide 37
http://afni.nimh.nih.gov/afni/community/board/read.php?1,82828,82832#msg-82832