How do I find the stock recovery.img for my ZE550KL?

I currently have the 1.16.40.763 stock firmware on my ZE550KL laser zenfone 2. Before I update the firmware or root it, I want to ensure that I can go back to this version of stock firmware. To do that i need the 1.16.40.763 stock recovery.img file.

Can someone/anyone please tell me how to find it on my phone or how to extract it from the firmware file on asus.com (I can't find it on the official update file on asus.com).

Thanks

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