But there were no available spare parts for any of them.

Just about everything available in those parts of Iceland was sold there.

There are hundreds (or maybe even thousands) of "parts" available.

He could not visualize any coherent whole from the available parts.

The parts generally available are those interchangeable with later model years.

The only significant part available was a head, but that was fine by him.

They are part of the public domain, available to everyone, but their usefulness goes much further than that.

Any still available parts went in the same direction.

I think we can build something ourselves with most of the parts available at a hardware store.

By then they knew that there would be no new parts available anywhere on the Ringworld.