fcwilt, do you mean to say that those drivers can be used with 12V LEDs? The first few say they use TRIACs, which die when you have a transformer load, so an LED system that's a transformer and rectifier will kill that kind of dimmer, leading me to wonder what the rest of the system is.
A good answer is easier with a clear question giving the make and model of everything. "The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw