TMM
OEM+
If you can't find the right size badge, you could get a badge that's slightly bigger with a filled in background so it completely hides the inset that it's supposed to sit in. I'm thinking the badge from a VY/VZ steering wheel might suit.
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A few years ago I was tempted to get genuine sill plates, but after seeing a pack of HSV sill plates at Holden for $200+ I looked elsewhere
I found non-genuine sill plates at Repco, they are a generic polished aluminium, with frosted strips. I got the set (2 long for front doors & 2 short for rear doors) for something like $80 total. They don't have Holden badges, but they suite the car and look like they were always there.