WTB - Genesis to usb controller adapter

i got a old mk superstick for the genesis that i want to use on my pc, anyone know where to buy or who makes a genesis to usb adapter

thx

the company that used to make them removed the product from their site.(4 triangles made them)

you are going to have to modify the pcb to fit a DB25.
http://www.hardwaresecrets.com/article/69