I assume you are talking about building a sandwich for use in a MiniMag. If so, you will need three items - a converter board (Badboy or Madmax), the bare emitter board and an emitter. Good luck finding a nice HD 1W or Lux III device. They seem to be in short supply.
The bare emitter board comes with the spacers. Because it doesn't cost very much, I suggest getting two or three of them. I always seem to have a lot of trouble with them; probably because I'm old and don't care to mod flashlights when I'm sober. From Wayne's site - the emitter board:
As you can see, there is a connection for the emitter cathode and anode. The solder pads are very small. It's best to have a lighted magnifier and vise or modeling clay to hold everything in place. And just because the cathode connection is connected to the emitter board's ground plane, don't assume you don't have do to a neat soldering job. Just the opposite is true. The outter area of the emitter board contacts the lip of the MiniMag and must seat fully for proper heat sinking. The inner area is where the emitter will be seated, so it too must be free of any solder blobs.
(Someone please verify if the following section is correct) - Test your completed sandwich first by connecting leads to the emitter anode and cathode with 3 volts. The LED should light up. If it doesn't, it means it's either reversed, open or shorted. Powering up the completed Badboy sandwich under these conditions will likely destroy the LT1618 chip or schottky diode.
Good luck. And remember, should you or any member of the IMF team be caught or killed, the Secratary will disavow any knowledge of your actions. This thread will self-destruct in 15 seconds.