Help! I have no idea what it's called, but it needs to be replaced....
 

The rubber around the base of your window...what's that called? Weather stripping? Not the hook-looking stuff that runs along the top of the inset of where your door closes - I'm talking about what's on each side of your window when it goes up and down.

I need to replace that on my '03 SC 430 -- somehow, both passenger and driver doors' rubber has cracked simultaneously :(

Any idea how much it would cost, if I could do it myself (or with the help of someone who knows cars-ish), or a good wholesaler to get that part from?

I'm a noob, any help is greatly appreciated! I don't want to roll my windows down until this is fixed because I'm afraid the rubber will rip more.

Thanks!