It has already been modified.

The outer pieces of scrap metal on both sides being held on with bolts are an aftermarket hack by an op and shouldn't be there.

That's why it isn't flat on either side.

I would take the whole assembly apart, clean it up (get that grey/white primer paint off with some turps) and see what you have got to work with from the original factory piece.

If the original pieces are most likely broken in two then maybe it can be repaired with some JB Weld.

Reference piece - not mine.