Dave, you didn't mention the year of your PT. If you have a 2001, see the following:
Install Kit:
http://www.sounddomain.com/sku/SCOCR1277B
Wire Harness:
http://www.sounddomain.com/sku/SCOCR01B
I've heard Chrysler may have changed the harness for 2002. Can anyone verify this and provide a vendor Part#?