hello, if i'm not mistaken, the slim 94mm fan comes with this cooler. so it could be that the screws are too short or the bracket doesn't fit. if you don't like noctua and need a smaller cooler because of lack of space, then i recommend the silverstone ar06, which is 58mm high. Unfortunately, it is not in stock at digitec.
And another tip: the performance of the noctua coolers is not only based on the good quality of the heatsinks but also on the super fans.