The 3090 Ti FE cooler is not compatible with the 3090 FE (non-Ti). While the PCB layout may look similar at first glance, it is actually very different in terms of mounting points, spacing, and component placement.
We no longer offer a cooler for the 3090 FE (non-Ti). That model is end-of-life and has been out of stock for quite some time. Unfortunately, I’m not able to help in this case — sorry about that.