The driver and passenger airbags will work, but as the side ones are now no longer there it would cause the light to come on, disabling them all (I believe).
If you know exactly what to get, you can just buy the resistors from Maplins as Has says.
The Recaro kit is available from their dealers, try
http://www.capitalseating.co.uk/ It is pretty steep at £20 odd per side though, largely due to being TUV approved (a strict German safety standard). However, it does come with all the connectors, crimp terminals and is fitted in such a way that the original airbag seats can just be plugged back in with no soldering or anything required.