HI Lexus Sport,
I have just checked the eibach.com website & they do have springs for a MK1 GS300 well at least the application guide said so, so all I have to do is find a dealer who can order them in.
I also checked with my dealer they said lexus dealers cannot supply them anymore because they are not supplied with them. If a spring get's damaged or something they have to get them made.
Thanks, for all your help guy's.
Regards,
Zishan.