Updated nVidia GeForce FX5200 U drivers

Does anyone knows where can I find any updated drivers for my iMac G5 64Mb nVidia FX5200 U video card? I checked the nVidia website, and they don't have drivers for Mac.

Specifically, the current Mac drivers don't support the OpenGL 2.0 Extensions completely (such as texture compression).

I've later learned that these updated drivers are released with every OS X update, when is the next update (10.4.3) due?

Does anybody know how can I request such drivers to Apple?

Thanks a lot and I appreciate all your answers!