I got the spiders at Autolumination.com

3157 Tail Light Brake Light Turn Signal LED Bulbs

^Scroll down the page and you'll find SMT spiders.

They are $27.99 a piece.

You need red because

1. if you clear, duh
2. The red lens filters out all light but red and white leds don't have much red light in them.

That's also where you can find the popular switchbacks. If you put spiders in your tails you'll need a modded flasher. So might as well get switchbacks.