I'm looking for a bracket like this for a pergola that will fit 4x4 posts . Any idea for alternatives ?
Would be good to see the design of your pergola @lindapenfold and know why you want that specific bracket.
Welcome to the Bunnings Workshop community @lindapenfold. It's great to have you join us and many thanks for your question.
I am not aware of any brackets similar to the linked product suitable for 4x4 posts.
As @ProjectPete has mentioned it would be helpful to hear further details on the design of your pergola. That way our members will be able to offer some great alternative solutions.
You should find this step-by-step tutorial helpful: How to build a pergola.
We look forward to hearing more about your project.