Bucket seat mounting studs

So on my 69 dart it still has the factory bucket seats. One of the studs to mount the seat in the car got broke over the years. I have the correct studs to replace them all. For the life of me I can't get the stud out. Are they welded in? Its "loose" and will move slightly but I just can't manage to get it out. Went as far as a BFH and still no luck.