Thanks for the replies. I found this on EBay.
PL1601G ATI 16mm 5/8" Green 24V AC DC LED Signal Indicator Pilot Light $3.95 each
Should be perfect for what I need. I just wanted an indicator light for my furnace monitor board to illuminate when the thermostat is calling for heat. That way I know what's going on when I view it remotely..
Just maybe you'll find out the light is on when the stat is off and off when the stat is on...depends on if you have a common wire or not.
In series w/o a common, in parallel w/ a common.
For others following along, 2-12 volt LEDs connected in series = 24 volts. ------O-----x-----O-----