there is a guy offering these kits but i would not do any business with him!
i lost money when i sent him money for parts and never got them and it seems i wasn't the only one. that guy is also a crazy weight-weenie but to a degree where it hurts. he has a bike as light as the lightest one you see on light-bikes.com
he also had it listed and was cheating to get it on 1st place....that's why it got deleted from the moderators of light-bikes. he was a regular in german weight-weenie forums as well but got "pushed" out from the user-community since he is just not an honest guy....
anyway - he sells such kits. VERY expensive.
you can get your SID almost as light by combining parts from different years.
lowers from pre-02
carbon steerer assembly from a SID wordlcup
internals from a '00 or '01 SID race (-156g)
aluminium cantistuds (if needed) and remove the disc adapter by shaving away completely (-9g)
new colour (my black colour weighs 3g. the standard metallic blue was ca. 35g)
replace lower bolts with aluminium (-3g)
total for y fork with the above modifications: 1063g
if you have any questions just feel free to contact me for help.
or do a search in this forum. i once made a thread with the detailed description on all the modifications on my "SID Project"
i just did the search myself:
here's the SID-tuning threads:
http://forums.mtbr.com/showthread.php?t=10111&highlight=sid+project
http://forums.mtbr.com/showthread.php?t=11480&highlight=sid+project