It must be obvious to you but I can't figure out the name of that part which I need to replace. It's added to the bolts that hold the PCB to the case so as to create a large enough gap between the two. It's basically a metal cylinder.
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I've heard them called standoffs and spacers. McMaster-Carr seems to make the distinction between if they're threaded (standoffs) or not (spacers).
These are known as spacers, or stand-offs.
Don't bother using McMaster-Carr for these if you're outside the USA. Firstly their web site won't let you look at more than two pages. Secondly they won't do business with you because of the 'complexity of shipping internationally'.
You're much better off using someone like Farnell. They are happy to ship to loads of countries around the world.