just an fyi if you buy the clear side marker lenses from wildwheels, there are threads about how you can remove the side marker assemblies and then bake them in the oven so you can pry off the amber lens and replace it with the clear one. I just did mine last weekend and I was able to remove the amber lenses by using a heat gun and a stiff putty knife. You have to be patient & careful to direct most of the heat at the lens so you don't start melting the gray housing.
also, reed's faq is a great resource for diy stuff. here's a link about changing your interior bulbs over to leds:
http://www.cadillacfaq.com/faq/answers/bulbs.html
BTW, welcome to the forum, you will hate this place cause you'll want to spend all yer $$$$ on mods!! :welcome: :nanaparty: