These go on the far outside of the grip (the very end of the bars) ... hence the term 'bar ends'. Nothing wrong with adding those to a bike like that. Two other options to look at that might be a little more comfy:
Specialized BG Contour Targa Grip/Bar End (combo)
http://www.specialized.com/us/en/bc/...jsp?spid=64418
Specialized Overendz Bar Ends
http://www.specialized.com/us/en/bc/...jsp?spid=64537