Shocks and springs, that's all afaik. There is a part number anomaly re the centre tie rod between models, but the parts themselves look exactly the same, and would only affect bump steer anyway. Roll bars are the same I believe.
Yours being pre face lift raises the question do you want to go to pre face lift mv6 or face lift mv6 which has lowered sports chassis which is 15mil lower than stock, as I under stand it. I'm not that familiar with pre face mv6, not sure if they are lowered via shocks on stock springs or what...?
IMO go for lsc shocks and springs all round via tc
Or go for Bilstein b4 shocks and look out for irmscher springs (second hand) or new stienmetz springs are available I believe.
Some say irmscher is a bit stiff, but as always, all things are relative in that if you've ever suffered the ride in a BMW Msport or audi then you'll find the firmest omega set up like riding on silk IMO.
mv6 is certainly firmer than Elite which is way too soft for anything over driving miss daisy, which is fine according to taste of course.
Best mv6 set up would be face lift lowered sports chassis mv6 (IMO) but depends what you want, it's your car so my taste may not suit yours.
Hth somehow. :-/