Super Pro now offer uprated suspension and axle bushes for the Megane 3 RS model range which includes the 250, 265 and 275 models.

At the front of the car they have their front lower control arm (wishbone) bush kit which contains the 4 polyurethane bushes (2 in each arm) complete with stainless steel inserts. 

Once fitted these uprated bushes have less movement meaning your suspension geometry will not alter as much as it will with the softer factory bushes in place.
 
PN: SPF3986K
 
Fitting kit Guide