Some modding required. According to Matt@coderedmotorsport "Heat up the stub, knock it out with a big hammer, cut the small flange off, grind/file it flat, modify the threads to accept countersunk bolts, bolt on 1*2 stubs with shims if you have some. Easy peasy!
Did it to one of the R5 gt turbos we race and my mk1 16v. Valvers use m8x1 bolts on the standard beam. The bolts are too short to re-use.
172 use 3 m10x1.5 and 1 m8x1.25 thread.
Drill out all 4 holes to 8.5mm and tap in a m10x1.5 thread into the beam.
And also drill out the fourth hole on the stub axle bigger to accept the m10 bolt. Top left one I believe.
You could in theory just find 4 longer m8x1 bolts use the standard holes and create a shim insert in the 172 stub axle to close up the hole.
But seeing as all the standard renault stuff fits I just bought 2 extra m10 bolts."
Images borrowed from Clio Sport
http://img94.imageshack.us/img94/8443/s6ir.jpg
http://img163.imageshack.us/img163/4418/5pbw.jpg
http://img4.imageshack.us/img4/6981/re8x.jpg
Clio 16v std rear width
Clio 16v rear beam with 172 Stub axles