Dell Precision 490 part numbers for Media card reader and cable.

Hello everyone. 

Blast from the past question here. 

I am trying to add a media card reader to an Dell Precision 490 box, and I'm having no luck locating factory part numbers for the media card readers or the cable that was used to hook it all up.

I do know the Dell GH483, HX835, and 0R6401 cables do not fit the mother board.  

I have visually confirmed the Dell Precision 690 use the same connector on the motherboard but I have been unable to locate part numbers for that system also.

Thanks for any information you can provide.