Does anyone know which Hydraulic Fluid to get for my Megane?

I have recently brought a 98 (R) Renault Megane Convertible. I have found that I am in need of Hydraulic Fluid for the electric roof. I have been to Halfords to get it (as mentioned in another reply) & they didnt know which one to give me. Does anyone know which Fluid I need. Also when I washed the car I have found that the rear (plasic zip in) window leaks. Does any know where I could get one?