Since the forum won't let me search for 7 or 8, I can't find anything on this. Is the spacing the same for 7/8 speed shifters? I'd looking to run some 8 speed bar end shifters on a 7 speed bike if possible. I figure if I just line up 7 of the gears and set my limit screws appropriately it should work out no problem.

And it's for my girlfriend, who isn't into biking yet and still hates friction shifting, so just using them in friction mode is a no-go.