There's no ADR issue with importing tail lights from the EU (E-marked). The rear fog will be on the wrong side, but as you aren't required to have a rear fog light in Australia you can just remove the globe. The reverse light can be on either side (most cars have two). Or yes, better yet get a UK market set. Bare in mind that a lot of eBay/ online parts aren't genuine and will be of a lower quality.