You can also try a place called Japarts which are based in North London and sell parts...:D
If you want them fitted they have a garage right next door and they are Lexus Specialists, they had a 2 page cover in Banzai magazine a few months back, not sure if anyone reads Banzai...
If you want I probably hook the club up with a discount...but thats if anyone wants it...if you just want it done...PM me your details and i'lll hook it up.
Nice guys and really professional...check out the website http://www.japarts.co.uk for the parts, http://www.jemservice.co.uk for the garage :D
wikid bunch of people...all used to work for Jemca (Lexus Edgware Road) down the road...!