Tae,
We do generally have this part, I am out but we should get more late next week. I would open the controller by removing the 4 screws on the back, units made before winter 2008 have a soldered in moonlight/photocell, those after have a plug in inside the controller. All replacements come with the plug but for the older solder version the plug is cut off and it must be soldered to the board. For this reason we generally only sell this part installed. The part is $32.