With most of the new Samsung USB ports they look much different than the others and have 7 pins as apposed to 5 which is another factor. To throw a wrench into the mix there are now many sellers offering these on eBay but there is a standard mount style and reverse meaning it will be flipped over with the side with more surface area against the logic board. I don't know why they don't seem to catch on but MOST of the sellers on eBay have it wrong. Here is a seller I KNOW and have dealt with before and I can tell you for sure this link is to the correct one on eBay. Keep in mind even if the picture is correct they might just be using a picture from the other along with the wrong info. If you need a port for a captivate and any tools like Torx kits here is the link you want. The item # is USB813 BTW.
http://www.ebay.com/itm/Micro-USB-Charging-Port-AT-T-Samsung-Captivate-Glide-SGH-I927-Infuse-4G-SGH-I997-/400311953071?pt=LH_DefaultDomain_0&hash=item5d3473a6af#ht_1745wt_1037
Hope this helps somebody.
Richard