I am changing my timing belt myself on my zafira gsi (z20let) and have had a few happenings when ordering the kit. I ordered everything i needed and payed for it, vauxhall told me i only needed one roller and whilst i told them I was sure there were two rollers on the car, they insisted there was only one. So anyway, when I stripped the car down i was right...there are two rollers so i was back on the phone to vauxhall only for them to tell me they had made a mistake and unfortunately did not have the other roller which i needed and had to order it...downed tools for a couple of days. Today, I went to collect it and carried on with my car to then find that they had given me a differnt roller to what I needed, it was deeper. On my car the two rollers are identical, however when I went back to vauxhall and they got the info up on the screen it was showing that my engine should have the one which they supplied (the deeper one)! In the end, the mechanics decided that even though it was showing I need two different rollers, I should stick to putting two of the same ones back on as thats how it was before. They cannot understand why this has happened and it has left me baffled. Has anyone else come accross this problem? Note: I've had the car from new and nobody has changed the belt before.