Add it yourself...
Lexus LS400 Power Antenna Mast Replacementhttp://www.carstereohelp.org/DoItYourselfRepair/LexusLS400PwrAntMast.htm
Lexus LS 400 '90-94 Car Stereo Removal and Installationhttp://www.carstereohelp.com/stereoremovalLexusLS400str.htm
LS400 Model 1996 - Stereo Backlight Fix - with link to step by step PDF - Lexus Owner Clubhttp://www.lexusownersclub.co.uk/forum/index.php?showtopic=46931&st=0&p=492278&fromsearch=1
Lexus LS 400 '90-94 CD Changer Removal and Installation, Nakamichi Amplifierhttp://www.carstereohelp.com/stereoremovalLexusLS400CDChgrR.htm
How to Build a Sealed Sub Boxhttp://www.lexls.com/tutorials/audio/subbox.html
How to Fit a 5.25" Speaker in a 4" Locationhttp://www.lexls.com/tutorials/audio/fspeaker.html
How to Fix a Lexus Power Antenna + Antenna Removal & Installhttp://www.lexls.com/tutorials/audio/powerantenna.html
How to Replace the Stock Subwoofer with a Aftermarket Subwooferhttp://www.lexls.com/tutorials/audio/subwoofer.html
How to Install an Aftermarket Stereohttp://www.lexls.com/tutorials/audio/headunit.html
Get sound from PC to Car Stereo / Amphttp://www.mp3car.com/vbulletin/faq-emporium/32430-how-get-sound-pc-car-stereo-amp.html
Soldering 101http://www.4runners.org/writeups/solder101/index.html
Learn How To Install A Car Radiohttp://www.popularmechanics.com/technology/upgrade/3380301.html
Series: Car Stereo Installation - how should I wire my amplifierhttp://www.clubknowledge.com/page5.html
Electronics Tips: Soldering Techniqueshttp://www.elexp.com/t_solder.htm
Technical Service Bulletin and Recall Informationhttp://www.alldatadiy.com/recalls/index.html
American Wire Gauge table and AWG Electrical Current Load Limitshttp://www.powerstream.com/Wire_Size.htm
Abbreviationshttp://www.gtfours.co.uk/what/abbrev/abbrev.htm