Master brake cylinder

I've bench bled master brake cylinders before, when I've replaced them. Now, I'm not replacing this E320 wagon's master brake cylinder, I just ran the brake fluid resevour dry, so I'm needing to get the air out of the MBC. I've bled the brakes three times and they're still slightly soft. The bench bleed kit, that I have from another car, doesn't fit this car. If I could just get a bench bleed kit that would fit this MBC, I'm pretty sure after bench bleeding my MBC (while still on the car) I could bleed the brake system once more and all would be well. Where could I get a MBC bench bleed kit that would fit, or do you have any other idias? 

Try this:
 
http://www.tooltopia.com/index.asp?PageAction=VIEWPROD&ProdID=25127