Porsche did not have 19" wheels for the 986, but came out with 19" wheels for the 987. So you have to go aftermarket or 987.
You can get a start here.
http://www.wheelenhancement.com/index.php?t=Wheels&PHPSESSID=4ad4eff8311de0eea941b7ca87eb1bdf
I can get your cousin a deal on a set of these....