Originally Posted by SkyDog75

That depends on which 600 brakes we're talking about. Old 600 single pivots, for example, were nowhere near that good. The ones you're likely to be find on an '89 Trek, like these, should be pretty good, though. But not quite as nice as the dual pivot 600's that followed in '91.

Getting back to the original question... What specific reach, in millimeters, do you need? Brakes come in a lot more sizing variations than "standard" and "long" reach. And do you need nutted or recessed mounting? Sheldon Brown's site describes and illustrates the difference HERE.