Hi Sam
I've found this facia for a single din unit. http://www.amazon.co.uk/Lexus-Stereo-Fascia-Dashboard-Adaptor/dp/B002RXEYG4/ref=sr_1_1?ie=UTF8&s=automotive&qid=1271627972&sr=8-1
rip out the lex headunit. plug this facia kit in and then add a aftermarket headunit.
Thanks
Knightwing23