They are bolt on,....be advised,....they are the kind that have a lift strut that mounts to a bracket that is bolted under the hinge mounting surface. (between the hood, and the hinge)
Maybe it's on top, don't remember......
They push the hood up like mad at the rear. That may be "adjustable", and with some tinkering w/ that, you may be able to eliminate that push, but for me, they pushed the monsters hood up and required soo much effort to overcome the lift force I knew that I'd fck something up with the bodywork on my flimsy assed structureless hood.
This is what they look like: