"Supermicro JBOD" should help you find the supermicro variants.
However I think you will find that they are all pretty much full depth so I don't know if that is something you want(?).
Their diskshelves are *mostly* (some exceptions) their server chassis with a blank for the ATX IO panel, a power board for fans, front panel switchc onnector (and the more expensive variety with BMC) and then a cable/bulkhead assembly for the type of internal storage cable to an external connector.
Also besides the various xyratex shelves, the Lenovo / Thinkstation SA120 can be found, new or used and which may nor may not be a xyratex thingie after looking at the pictures...