The official name for those wheels is Boxster S II. As TStone pointed out, they're a 987 18" wheel.
The more popular 18" wheel on a 987 was the Cayman S wheel.
Either of these wheels should work on a 986. There have been various threads here talking about fitting them on 986s.
Here are lobster claws.
And Jay wanted to throw me out because I own 987s. Where would you get your 987 content w/o me?