look on the CL board for a guy name hichymon somthing like that iu know it started with an "H" he use to post all over the old board selling this machine knob products if you can access the old board you can do a search
His name is Hamony and he posted under hchon or hcchon or something like that. Those knobs (along with the OEM 6 disc changer knobs and door locks) were custom made and offered for a small period of time. Check the old v6accord.com forums.
Here are some pics. Pleae not, there is no hole for light to pass through the knob at night. I don't have any problem with it though. Just so your not suprised if you get them and there this way, its by design. I have the blue LED conversion and can see the black line at night. Here are some pics: