Someone posted this video on Surrey Scoobies a while back and I raised the point then as well!
I did some reading at the time (because I'm sad like that). From the big book of Impreza nerdiness I present Exhibit A:
And Exhibit B:
So the 555 corresponds to the V-Limited, not the WR1. And if you are still not convinced:
http://www.type-ra.co.uk/pdf/2003-v-lim.pdf
The original Japanese brochure; looks
identical to Solbergs car. So, as ChrisP says, its #0 of the 2003 V-Limited.
(
NB: And I think it looks a lot nicer than the WR1: sorry WR1 owners!
)