Attention to this product.
In the version: IB-3810U3 I use WD RED-PRO 10TB disks.
Now I wanted to upgrade to WD RED-PRO 14TB.
Had to realise that these things only fit in the top two bays.
The connection must be on the back of the new drives, because the dimensions of the new
The dimensions of the new drives are exactly the same.

Question

Attention to this product.
In the version: IB-3810U3 I use WD RED-PRO 10TB disks.
Now I wanted to upgrade to WD RED-PRO 14TB.
Had to realise that these things only fit in the top two bays.  
The connection must be on the back of the new drives, because the dimensions of the new
The dimensions of the new drives are exactly the same.

Answer

Do you mean those slits in the plastic to the left and right of the contacts ?
https://www.disctech.com/SCASite/product_images/0A31619_1000-3.jpg?resizeid=9&resizeh=650&resizew=650

Otherwise, if you want to enlighten me (and others), you can upload a photo here:
https://www.swisstransfer.com/de

Answer

The connections are actually standardised. I could imagine that the deviation is only very slight (much less than 1 mm) and that with a little gentle pressure in the right place it can still be installed.
Otherwise, I would briefly contact ICY BOX to see if they are aware of something like this.
https://icybox.de/

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