Well I already did it and it worked!
First I added the 500gb and it mirrored the drive(took about 30min)
Then I removed the bad drive and rebooted to make sure everything was fine.
Then I reverted the raid to normal and it said my data would be lost but it remained intact.
Booted up and noticed I only have a 72gig drive but I went to the disk management and was able to expand the drive to full size.
I think next time I get a new drive I will just raid them and mirror then unraid, seems pretty simple.
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