Are those rings around the air vents meant to be silver? I've only ever seen black ones so I'm wondering if this was a mod that the previous owner did or if it was an optional extra or something?
Not standard, they're normally just plain black plastic. You can get them in the silver, a couple different wood effects, carbon, blue and probably other colours if you look around on Rakuten or Yahoo Japan. I've ordered them in Piano Black, along with an Ultimate Edition Piano Black fascia for the centre console, I actually wanted that colour but it helps that it's also cheaper by a huge amount, possibly because they were made for the ultimate, I'm not sure. Most sets are £95 for the 4, the Piano Black air vent rings are only £7.71 each so £30 the set. I also got hugely lucky and got the centre fascia for £9 on auction because it has a tiny mark on the driver's side. Here's a few of the diff ones- Shop Rakuten Japan - ZenMarket.jp - Japan Shopping & Proxy Service
Some places will even chrome your existing ones, but I don't know if it's more cost-effective than buying new ones.