Kremmit is correct, I had an old arkanoid spinner I got from ebay, the optic board didn't work, but it looked just like the boards from several of the trackballs/spinners I've seen, same connector, similar optics, etc.
If you can figure out which pins are the +5V and ground then you should be able to plug it directly into an optipac/optiwiz/mouse hack without the need for a new optics board.
fixumdude