They're available on Karr's page here: http://karr.myweb.hinet.net and they're binary files since they're meant to be used with the LtnFlash program. Most of them are unreleased, but some have been out for a while.
LITE-ON DVD+RW LDW-401S - ES0C
LITE-ON COMBO LTC-48161H - KH0M Jul09 ,2003
SlimtypeCOMBO LSC-24082K - JK0A Jul07 ,2003
SlimtypeCOMBO LSC-24081 - 3M0D
SlimtypeCOMBO LSC-24081M - 3M3A
LITE-ON LTR-52327S - QS09 May21 ,2003 (forgot to change this?)
JLMS XJ-HD165H - CH12
SlimtypeDVD-ROM LSD-081 - AM0Z
JLMS XJ-SD081D - BM07
All of the new ones are on my site now. Karr may be removing them soon, so if he does, then you can get them from me.