cruisergeo, I have not seen nor have I been able to find a rain gutter for the PT. The side window deflectors should work for you.
I have the side window deflectors that go into the window channel. These allow you to roll your window down 2" to 3" and keep the rain out. Several places sale these, and they are usually listed on e-bay, here are a couple of places to look so you can see what I'm talking about.
http://www.revelenterprises.com/pt_c...ards_smoke.htm
http://www.jjproducts.net/PTCruiser/...Deflector.html