I think people with 10.4.10 don't need the security update.I tried to install it and it wouldn't let me.
It showed up for my 2.5 G5 and my 17 high-res MBPro. Just fyi. ;-)
(also running Safari 2.0.4)
(Also for, G4 iMac (about 4 years old) and a 23 inch Intel iMac runin 10.4.10 also.)