This monitor supports 75 x 75 mm. But I remember you also need to purchase 4x additional standoff to support the VESA bracket.

https://www.amazon.com/Standoff-Threaded-Mounting-Motherboard-Assortment/dp/B06XCNF6HK/ref=sr_1_12_sspa?c=ts&keywords=Standoffs&qid=1686818925&s=industrial&sr=1-12-spons&ts_id=6909196011&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEyV0pUOUdOU1JVMjU4JmVuY3J5cHRlZElkPUExMDE0MDMwMUg5NDFHOUUxV0ZENSZlbmNyeXB0ZWRBZElkPUEwMTUwNTY0M1U5UEZRSkw4TlQ3RCZ3aWRnZXROYW1lPXNwX210ZiZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU=