i own an sti III wagon v-limited 1997 and i would like to change the geometry set up for a more oversteer set up, like a gr.N tarmac geometry.
does anyone know the numbers?

 

Think you probably need a little more than the standard suspension to get it to oversteer a more - there are tons of threads on here about this kind of thing. Whiteline adjustable ARB and alloy drop links on the rear are the starting point for just about everyone, then the anti-lift kit for the front, at which point you will already have got rid of a lot of the understeer. But the geometry seems to come down to a choice between Prodrive or Whiteline. IIRC Prodrive settings are a bit of negative camber and toe in on every wheel. Whiteline settings are 1 degree negative camber on every wheel, no toe on the front, and 1mm toe out per side on the rear. I run Whiteline settings with the above Whiteline kit, KYB dampers and Eibach springs and it oversteers about as much as a 4wd car can be made to.