Does this: robotshop.com/hc-sr04-ultrasonic-range-finder.html fit on this: robotshop.com/productinfo.aspx?pc=RB-Lyn-75&lang=en-US
While the mount specifically mentions other sensors, the dimensions seem to be eerily identical.
Good call - unfortunately that sensor does not use the same mounting as most manufacturers and therefore that sensor’s holes do not line up with those of the mount.