Just replaced my pump for Meyle , but it may be unknown in your neck of the woods. Made in Germany ,it comes with all seals and thermostat top . Just want to say, that a lot of leaks are from the O ring on the side it fits to the engine. I put sealer on my pump even though it as this O ring as well.But if you use a little sealer ,on fitting it to the engine dont remove it once its in place . If you do the O ring will come out of its grove . Replace tensioner as well and check your pullys . The bracket that holds the belt tensioner as a bolt going in to the timing case to secure it,this as to have a little sealant on also or you will have oil leaking from it .Not many know this .Thats if your engine is the m103 ..may be the same with m104 not sure,. First thing is use a camera to picture step by step as you go on .So you know how to replace all the parts .