Like Randall, I bought a set new/already painted on Ebay, but then found the same seller had a website that was a few dollars less. I also bolted them on without taking the bumper off. Actually I never thought of taking it off. Maybe it would have been easier, but it really wasn't too bad. Here is the website in case you are interested:
http://app.vendio.com/storefront?view=ITEM_DETAIL&lid=322598520&cid=10774043&mode=1
I really think they look good on a 986!
I also just switched to the smoked LED 3rd brake light from a different Ebay seller, and it was plug and play. They said sometime you need to cut and swap the wires (polarity issue), but that it is uncommon.
Good luck.