What port is this *picture* (mid 2007 13 inch macbook)?
This pictured connector on your mid 2007 13 inch MacBook is a mini DVI connector according to http://support.apple.com/kb/HT3235



The Apple part number for the Apple Mini-DVI to VGA Adapter is: M9320G.

And the eBay link: http://www.ebay.com/sch/i.html?_nkw=M9320G