Was in my local tyre dealer and saw this up against the wall.
It belongs to Shoalhaven Heads RSL Sub Branch for their gate guard but rust and someone's welding have damaged it beyond use.
I don't know the piece, but if you can help out with a servicable replacement contact the RSL club (02) 4448 8964 or Cookes Tyre Service Nowra. (02) 4421 7344