Matching architrave

We've got the same architrave throughout the whole house, but one or two are a bit bashed up so I'd like to replace them as we go around and decorate. However, I'm having trouble matching the architrave - Bunnings don't have the same, and a search online hasn't revealed any matches.

Hopefully someone here can identify it and point me in the right direction as to where I might be able to get it - I'm on Sydney's northern beaches.

Thanks in advance

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