Repco, etc should have them - go in, tell them what car you've got, and they should be able to give you the options available.
That said, we're currently running a group buy from ECS Tuning in the US if you're interested - check their website (http://www.ecstuning.com) to see if they list what you need, if so, let me know in the EOI thread, and we'll see what sort of pricing we can get for you!
For fitting - you just need an appropriate sized (diameter and length) socket - take off the distributor leads, remove the old ones, insert the new ones (probably best to ensure the gap's set correctly), re-attach leads. That's it!
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