Thanks CJ, that was the info I was looking for.
Thanks to Perfectlap for the CCW link. I had lost them in a hard-drive meltdown, I was interested in using their wheels on a race project that fell through couple years back.
Check these out:
http://www.ccwheel.com/files/wheelprofiles-display.php?id=C140
They have 18x8.5 and 18x9.5, but I don't know the et on them.
If I remember the Carreras that fit the 987 are 18x8 et 50mm front and 18x10 et 47mm rear.