Hello together ,don’t scare but I mean it seriously since I don’t want to do something wrong at the beginning of the topic timing belts . I’m talking now only about buying …… Is it necessary to get the parts rollers , timing belts and wapu as original parts at Opel or does the ruched from the accessories and if so which manufacturers are recommended ? I hope the question as such is not too stupid ? Greeting from the one who doesn’t know himself at all .