Adey,
I've recently done a similar conversion on my 11 turbo - here's how I went about it.
Firstly I got hold of some new 19 16v wishbones and a Polybush motorsport (black) camber adjustable inner bush kit.
The outer steel sleeve is a good press fit on the wishbones but I elected to weld mine in place for a bit of additional rigidity:-
I then added a Ruanova 'uniball' kit (ruanovaperformance.com) in place of the lower ball joint. This is a key part of the conversion as it raises the hub height, widens the track and effectively lowers the suspension without too much geometry change (Ruanova are a great company to deal with):-
However, in order to be able to deal with any bump steer issues and to ensure the steering arms had enough width - I added a Pure Motorsport bump steer adjustment kit as can be seen above. Pure Motorsport also do a kit similar to the Ruanova one and will have everything you need for the conversion - but not everything is required....
The next job for me was finding some coil-overs for the front. I bought some Group A units from Soben. These have camber adjustable lower mounts for camber, adjustable top mounts, spring platforms and bump / rebound :-
I have retained the standard 11 turbo uprights and driveshafts without too much modification - but the final piece of the jigsaw was the use of Clio Williams bearings (+2cm) in the hubs and some Pure Motorsport wheel studs:-
As you can see from the pictures, the use of these bits and pieces has allowed me to keep the original anti roll bar using the same mountings (but with Polybush Motorsport bushings.
On the rear I've again used Soben adjustable Gp A shocks with a Ruanova Gp A stub axle kit which, while increasing the width, is also adjustable (with shims) for camber a toe:-
Links:-
Suspension - Clio 2 PH1 172
http://ruanovaperformance.com/gb/suspension/51-unibal-bottom-ball-joint-renault-kit.html
Soben amortisseurs rallye, VHC et raid
I'm pretty sure you'll find everything you need from these three sites, but I think I got the bearings and wishbones from Aceparts in the UK.
Hope this helps!