That pad looks just like the one I have! I know for sure mine is the not a legit Red Octane one, the only difference I see with yours and mine is that the D Sub conenctor is gray instead of black.
The pin outs are different between the 6 arrow and the 8 arrow pad, even though they both use the same 15 pin connector.
(I didn't bother trying to find which 4 wires went to the leds for Up Down Left Right)
8 Arrow Pinout
2- Up Left
3- Ground for 2 and 4
4- Up Right
5-Down Right
9- Down Left
11- Right
12- Left
13- Down
14- Up
15- Ground
6 arrow Pinout
5- Ground
7- Up
8- Down
9- Left
10- Right
14- Up Right
15 - Up left
I made a cable to switch the 6 arrow pinout to match the 8 arrow one so I could use it on the same setup I have for it. Its hooked up to my multiconsole (PS2,3,Xbox, xbox360) joystick where its mapped to the buttons Sqr Tri X O so I don't run into any axis problems when I use it on PC.