Lastest update on the rear brakes, after buying a set of 93 citreon XM front brakes, they are the same aprt from a bit of machining on the caliper mount, why its there who knows it's not a clearance problem.
Maybe its so Renault can charge 20 times as much for them.
So seal kits and spares are available on the web for these under the XM lists, I am almost sure the Citreon Xsara calipers are the same too but the caliper mount and pad holder are different as they take a smaller pad.
Pictures of said brakes one showing an angle grinder mod in the caliper holder. Red caliper is original clio V6
Big Red do seal kits and BRakeparts on-line do calipers and all the spare parts. brakeparts on line go for vin 5229 on
LINK