I don't think you'll find a replacement mount that matches the circular default mount. You're probably best looking for a VESA mount, perhaps one that clamps to the back edge of the desk if you don't want to drill into the wall.
Some mount kits include plastic spacers and longer screws for recessed mounting holes like this monitor has. If you buy a mount without those you could get a stack of washers and longer screws from a hardware store.
A bus station is where a bus stops. A train station is where a train stops. On my desk, I have a work station…