Resurrecting an eight years old thread!
I noticed last week only the right half of the LED center brake lights on the spoiler still work on my car, removing the unit allowed me to see some of the LED's on the left side have overheated and broken off the circuit board inside, it's impossible to easily open the assembly to replace the LED's since the unit is solvent bonded together.
The spoiler on my car is an aftermarket unit, the LED brake light looks to be the same style and size as the OEM one, however the '09 Civic Si brake light is insanely expensive now at US$220 from all the Honda dealerships, the sale that was on back in 2011 on the 8th Gen Civic forum was a steal at $40 each, alas it is no longer available at that price. The unit from spoilerlights.com will end up being close to CDN$100 with shipping, currency conversion and tax/duty.
I was able to score a brand new '09 Civic Si spoiler with the clear housing at a reasonable price from the local buy-and-sale site, it took some time to fit the LED light to my aftermarket spoiler since the OEM light has a protruding wiring housing, so I had to drill and file the the opening on the aftermarket spoiler to fit. I also had to splice in the bullet style connector to the aftermarket wiring. Finally the spacing on the aftermarket spoiler is just a tiny bit tight so it was a very snug fit when I installed the clear LED unit.
Overall I do like the look, especially on a light color car like mine, the brightness is very good too, I will soon add the flasher electronics to this new light, should be easy now with the bullet style connectors already in place.