Hi,
Hope the V50 is treating you well...
No need to buy a replacement emblem or airbag.
What you need is a 'polydome' label.
(basically a sticker with that domed plastic look)
Have a look at this website:
www.davebarton.com/VolvoStickers.html
Scroll down and look for "...LATE MODEL POLY DOME "VOLVO" Steering Wheel Emblem Inserts..."
You'll see a picture of your steering wheel.
If you are still looking for mats - let me know what colour interior you have.