That's not a part that will still be available from Apple. Best bet might be finding someone who still has the box/accessories.
That said, unless this is for purposes of stocking your collection of Apple equipment, ANY iPhone or iPad power brick will work fine, as will most 5V USB power bricks.
If nobody confirms the version number, I'll check the one I have at work tomorrow. It's the last thing I still have from my 2007 iPhone. I'm guessing you're trying to find the exact item to make an original box complete?