Renault don't supply them on their own, only the full arm at £300+ for both.
They have a nut on them so not having much luck so far..
I was going to send you a PM there, seen your thread with the Meyle stuff
ECP don't do them for Renaultsport Megane's, they list a 2.0 but it's completely different.
I've looked at the LCA on most sites but none are for the RS. There's a guy works for Renault on Meganesport.net and he confirmed that the LCA is a Renault only part.
I've been into Craigavon Auto Parts and his system only brought up the aforementioned boggo 2.0 so no use
"ball joint has a tread on the taper where a nut would go on to"
The suspension is a pain in the arse to work at
But it makes it handle well
Are you able to check for any joints with a tapered end? Could maybe see if it is anyway similar..