Hiya mate, my Mums clio is the same, I seem to have fixed it though. If you notice when you put the sunroof back on, you will see where the 'tabs' of the 'sunroof' go into the car, there are holes going directly going into the car, if you take the surround of in the car and slightly pull down on the headlining you will the holes, I simply just put silicone on, you can' smooth off' with your finger from underneath, bearing in mind when you put the sunroof back on it stil maybe tacky and may disturb the silicone,so smooth off again when sunroof is in situe. Also there are 10mm SQUARE holes, not round they are the drain holes, the SQUARE holes go directly into the car aswell, I just filled them with silicone, it's seemed to have done the trick. Before I took the sunnroof off and studied it I could have safe the 'old dear' 40 quid on a seal off ebay, but I thought the seal had fatiged anyway, but there is a plus out of this.....its seemed to have lost its 'rattle'.I hope you can understand that, hope it works?!
Regards
Jon
crabtreenc24, August 2010