Okay so from the above pics, I'm sure you can tell that I have already installed my LED's. As yu'll note, I used 4" LED's for the brake, 2.5" LED's for the turn signals, and a 4" incandescent white light for the reverse. The reason I used an incandescent for the reverse is because of the cost of the LED's:
1x red or amber 4" LED = $20
1x red or amber 2.5" LED = $10
1x white 4" LED = $80
Why the price difference? Well, if you put clear LED's behind a clear lense, you get a bright light comparable to a headlight. No good for an indicator lamp. So what they do that makes a "white" LED white, is they inject the casing (sealed) with a certain gas that gives it a tint of blue to make it look more "white" looking. So because they are fairly new on the market (in Canada), and because of the extra step they put into it, the "white" LED's are expensive.
Unfortunately, I didn't have that kind of $$$ to throw around quite yet, so I went with the $5 alternative of a white incandescent reverse light.