https://www.amazon.com/gp/product/B01K1JJHTO/
It’s a " V7 RMWC6U-1N 6U". It says 6U, but it technically has space for 8-9Us, but the top and bottom ones would be cramped. Has about 19in of depth depending on how you adjust the posts.
This is the 2U case I’m using for TrueNAS: Logic Case SC-23800-HTPC | 2U Short Depth HTPC Server Case w/ 3 x Hot Swap
Hard to find one this short with decent number of drive bays, I managed to cram 6 3.5in drives and 2 2.5in SSDs in there. Along with a Slotloading BluRay Reader.
Here’s a video and a picture, it’s a bit older though. Imgur: The magic of the Internet