5th May 2022, 04:38 PM
The mounting (screw) holes in Australian wall-plates are 3 1/4 Inches (82.5 mm) apart - which is the same as the US design on which they were based.
The width of the "hole" in a current (HPM) wall-bracket is 3 1/8 Inches (79.0 mm) and could not be much wider, considering the mounting holes spacing. ( https://www.bunnings.com.au/hpm-mounting-block-bracket_p4332104 )
However, it appears that your "old" wall-bracket has a hole which is not so wide.
You could use a "Mounting-Block" to space...