"Kinda" found this by accident, but i thought to pass this along... I found myself needing more USB2 ports and was going to go the external powered hub route... Having just switched cases and remembered that i saw something on my motherboard that made me think ( unusual occurrence) There was a unused USB 2 header on the motherboard. So i thought to give it a "look see" and try something... Found this Link explaining the connections and offered a 2 port USB Plate adapter...It worked ...
Bottom line: if you need more USB ports ..have a look at your motherboard there may be some that are already there ...just not used. Regards Fred
PS: The connector is made by "StarTech.com"... if you want to explore other options