http://www.showcars-bodyparts.com/pontiac.html
Here is the link. I would think from what they say the front fenders would be the area that is shorter than the US cars. I have not bought from them but is what I have heard. As a last resort I guess a poor panel is better than no panel.
If they are the same as the Catalina then try Steve at
www.pontiacheaven.org
If you would like to measure the fender from the door to the opening of the wheel I can measure mine and compare the difference.
Pat