I installed all of the aftermarket lights because I HATE YELLOW, if I could find the tails that have the red with clear stripe (no yellow) I would put those in.
Here: https://www.flatironstuning.com/p-2066-gc8-jdm-taillights.aspx Otherwise it looks good and looks pretty rust free from the distance in the pics. Welcome to the forum!
If those JDM tails are a little spendy for you, I think lightly smoking the clear portion of your altezza-style rears would go a long way to making them look less dated (sorry ;) and would not cost much at all, just a little time and patience! Nice car.
Weekly meet every Tuesday night, just hang out and talk about cars : ) Details here: http://mnsubaru.com/threads/the-official-tuesday-meets-boom-island.44492/ BTW it's a good idea to quote a person's message, that way they get an alert that you responded to them