Sorry mate, I must've misunderstood your inital post. I saw HB4 and bulb caps, put the two together and got three... sorry, lol.
What I think you're after, is an LED Dash kit. Fargo will advise you more on the subject once he comes along, but in the meanwhile... i think this is what you're after >
http://www.lexusownersclub.co.uk/forum/ind...mod&id=3130
:D