The vent rings (RRP £25), gear surround (RRP £15) and in dash holder (RRP £45, expensive for what it is but i wouldnt be with out it now) all came from SEAT directly, have a word with Dave @ sere, he'll sort you out for them cheaper than the rrp ££
the rest came from eBay from a seller called car style bits
http://cgi.ebay.co.uk/Seat-IBIZA-20...arts_Vehicles_CarParts_SM?hash=item2ea6689505
again pricey but well worth it.
they are all simple to fit with the exception of the vent rings which are fiddle as anything but simple once you get your technique sorted out and remove the vent itself