Looks like a sub-frame mount. Was that picture taken with the front wheels off the ground? If not take another with the wheel off the ground so we can better see if the mount is separating (it does look separated to me). Your chasis should have 4 mounts, 2 each side, for and aft of the spring, I believe.
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.