Stuck Bolt on Front fender tirm. Ideas?

By fender I assume you're talking about the front. Here's a couple images from my '70. The front and the rear. Which one is not coming out?

Have you tried wedging a screw driver or chisel under the head as you turn it to see if you can get it to get a little bite and come out of the hole?

View attachment front.jpg

View attachment rear.jpg