Getting hold of older mobility drivers?

I have been trying to revert to the older 10.10 driver for my mobility 4670.
However I can only ever find 10.11 which I already have.
Searches for 10.10 only get me the desktop version of the package which needless to say doesn't install properly.


Does anyone know how and where to get older "mobility" ati drivers from? As I need to change my driver to fix a blu-ray playback issue that seemingly only occurred with this newest driver.

Thanks