hi i had the same build , y60 , Aorus 4090
i bought the EZDIY-FAB and the side brackets do not fit at all , only the main bracket where you fit the GPU in works, i managed to fit into the casing and slot in the Y60 ( after removing all the windows) with only the main bracket , although the entire 4090 is a bit wobbly.
i can fit in my DP cable in the back. Kinda suspect we bough the wrong gpu bracket.
EDIT: this is the product that i bought
https://www.amazon.sg/dp/B096MC89C5?ref=ppx_yo2ov_dt_b_product_details&th=1
shld have bought this instead:
https://www.amazon.com/dp/B096MC685G/ref=dp_iou_view_item?ie=UTF8&th=1
The Suprim X is a chonker of a card, bigger than some of the 4000 series. So they're correct, it won't fit if mounted the way Hyte intended. One of my last builds was in a Y60 with a PNY 4090 that was 6mm shorter and 4mm thinner than yours. It was sitting right against the glass, and couldn't ventilate well.
Luckily we can mod these things. I removed the riser cable and mount from the case, then mounted the card into this adapter. It allowed me to move the card back a little and lean it back so it had room to breathe. Here are some pics to give you an idea what I mean. I used a Dremel to make it easier to access the ports on the card, but that's not strictly necessary. This mount has magnetic feet, but basically just sits on the floor of the case. With the weight of the card it was secure, but you'd obviously have to be careful moving the case around.
Hope this helps.