Like mine?
PM parkedcar. He did mine. I got a nice small one, not like the giant ones you see on ricer mobiles, or like the big SVT Contour ones that showed up on eBay a while back. The color is gunmetal.
Also, if you get a small one like mine, stick it on the windshield no lower than where mine is. Just a few mm lower, it would touch the wipers when they go up and down. I would think over time the surface of the vinyl where the wiper hits would look different than the areas untouched, and it might also start to peel or get some glue on your wipers.