I went to autozone and they
 

I went to autozone and they verified it was 921. I went to the aisle and it was in fact a 921. So I ordered a 9 LED 921. Now my brake setup will be a complete LED set up, and so will my licnese plate.

Finally I will save some power. and some fuel too.

Ok I checked out the new
 

Ok I checked out the new license plate LED's which include 6 LED's in a bulb and they are bright and white. So now I won't get pulled over. So what's left is the 3rd brake light. Still waiting for it in the mail. I also tweaked my a/c so it even wastes less power while i'm driving.

wiring LEDs
 

Hey I noticed that you wire the LEDs to a resistor - one for each - you know you can string them in series. Depending upon color, they have a different voltage drop - red is about 1.5 volts when lit so you can run about 9 in series and one resistor and this will reduce the power used by a factor of 9x less and lower your parts count. White LEDs drop about 2.5 volts so you can only put about 4 or 5 in series because when the battery voltage gets low with the engine off that the LEDs will get dim and go out.

I bought them. There are
 

I bought them. There are small resistors inside the LED case.

There is one resistor in my 12 RED LED bulb and one resistor in the 6 White LED bulb too. I don't understand anything expept that if I use LED's I'll save power and the less LED's I use the less power they waste. I have the minimum amount of LED for my brake lights but the license plate was too dim and I had to go with more. I'm still saving a lot of power.