I don't think Koni make ready to run coilovers, you will have to get the Koni coil over kit, which is a weld on setup, someone else might be able to confirm?

I run Koni adjustable shocks all round and it is almost as good as a track setup, I just don't have the adjustable ease of coilovers.

if you have the money why not go S13 front end??? a lot more option for the suspension setup.