I'm currently replacing my drawer fronts with new ones, and I'm using the same type of hardware to install the fake fronts in front of the sink. Try Sears hardware, I find they always have what you need.
I have had the same problem and can't find anything like this in any harware store. I finally found the missing link. It's from Hafele and you can order small quantities at BuyHalefe.com:
Linear Mode
