So yesterday while hooking up a trailer, my mum managed to hit my rear passenger tail light. The indicator casing now has a whole in it, and the whole body is loose.

I havent yet climbed into the boot to attempt to find out how to tighten/remove it.

Can I buy the indicator cover seperately or does the whole cluster have to be replaced? Where would I go about buying such a thing?

You would need to replace the whole thing. Being a TE and if your not looking at changing to a TH or Verada tails, im sure there would be a few members with a set lying around. Post up in the WTB section

jump into the boot pull the carpet back and the tail light should come out when u un-do three screws. U can get a second-hand tail light from the wreckers, its a pretty cheap fix.

Im going to be selling the car (bought a SSS) so dont really want to buy 2 sets of taillights =P

go to a wreckers that allows you to take out the parts yourself and u shud be able to get just the 1.

Fair point - just gotta find out where there are wreckers near me lol

LOL! you're doing the opposite of me I'm getting rid of a pulsar in favour of a TE exec lol If you're feeling lazy eBay has some individuall TE tails for a price that should only be considered as it's convenient
http://cgi.ebay.com.au/TE-TF-MAGNA-SEDAN-LH-TAIL-LIGHT-GOOD-CONDITION-/270569780246?cmd=ViewItem&pt=AU_Car_Parts_Accessories&hash=item3eff373416 for example
But if you can be bothered upgrading get whatever is cheap at the time and get a set TF and TH tails will both fit with no modification (i just picked up a set of TH tails for 45 bucks and they look great)
And as far as install goes it's 3 bolts and a clip behind the carpet in your boot. Easy as.

If you already solved your problems just ignore me :-p