I finally finished the replacement of our 8 halogen "puck" lights with LED bulbs. Since the LEDs use a different type of dimmer switch (a 4-wire instead of the existing 2-wire switch), the 3 dimmers got replaced also. Take a look at the Alpine Quick Tips and Easy Mods page for more info, photos and sources.
If you want to avoid looking at the photos, here is where I bought the dimmers:
Kick Lighting (www.kicklighting.com
Model KR6 for $16 each plus mailing.
Quick Tips & Easy Mods- Alpine Style