Hello together, on my Megane (1.6L 75PS EZ 6/1998, SchlNr. 3004/750, 110tkm) the head gasket leaks (looks at least after it, because there is a lot of air(pressure) in the system and the pumping system fluctuates and the heating suddenly gets cold. Don’t think that this can only be the thermostat.) On the occasion I want to renew the timing belt, wapu and thermostat In search of parts I have seen in various internet shops that for the motor e.g. . Head screws from 3 different manufacturers from 18 to 70 euros are offered. With one set there are extension screws. That should be all extension screws or? And with the head seal and WaPu it is similar to the prices. Supposedly all original equipment quality. Can someone tell me if I can just take the cheapest, or the middle? Expensive does not always have to be better… Oh yes, and the thermostat has different diameters for the engine type. Where should I w what does it fit if I don’t break it up first? Does anyone know advice? Do you have information about the moments of suit etc. ? A thousand thanks already!