the galvo braket was ontop of the fire wall but it`s best to fit it underneath now to help 'samdwhich" the fire wallo & helps prevent the body from cracking
they were all fitted with a thin rubber slab originally too but that just makes the braketry all loss & wobble & crack also
so,,, fit it sandwhiched & tight & solid & you`ll be fine
the heater holes are not 'covered" by the steady bar brkt,,, the hole is still open,,, same as the other hole,,, just so you can fit both heater hoses through them
got it?
if you want them blanked off if you are not using a heater then get 2x rubber grommets of the right size
got it???
cheers
matt