Chemical paint strippers are all garbage now a days. Sand blaster would work for odd shape stuff. Large flat areas I've been using a heat gun and a long handled razor blade, works great
I might be interested,, I need some for my 78
Edit: Looking around their site I don't see that part, do you have a pic of what you have? and I'm also curious what you originally wanted.
I just peeled back the other side fender trim and it doesn't have the same set up either. So what I thought was an unmolested truck might have replacement fenders, or they stopped doing it for the 85's