I can't remember off the top of my head, I think noctua's rubber/silicone screws are a bit wider than others. Are you sure the sound is from the fan vibrating and causing the case to vibrate? Or is it some other sound from the fan?
Just trying to make sure you're addressing the right issue to cure the noise you're getting. If it's a metallic vibration from the case dampeners will help. If it's a 'hum' from the fan due to the bearing then they won't fix that. If it's air noise blowing through the top filter and grill it won't help.
The slots are pretty wide, I've got the same case with a couple noctua 140mm fans mounted up top. The mounting screws (actual screws, not silicone plugs) barely capture the edges of the slots. It looks dubious but it's enough to keep them secure. With a good quality fan there shouldn't be a vibration issue, both of them are hard mounted with no soft rubber 'screws' or any anti-vibration silicone corners on the fan frames. There's no resonating vibration at all.
I also removed the mesh filter from the top panel since mine are exhaust (if yours is intake you'll want to leave it in place). It was restricting airflow a fair amount and adding unnecessary wind noise.