Wrong Master Cylinder?

Sadly, I had already bench bleed and painted it before I realized it was wrong, and I don't know know if I still have the box. I checked to see if I ordered the wrong part. The one I ordered CLEARLY states front disc/rear drum, non-power, which is what I want.
I sent an email to Rockauto to see what, if anything, they will do for me...we'll see what happens...
Addendum...the one I ordered IS the one I received...right description, wrong part