Laurie,
I hope they know what they are doing...
Take a look:
Upper pad is the old one, carefully lined up woth the new pad beow, face to face.
The new pads were ordered from the factory via Williams, as you know. So they must be correct?
The new pads hace a slightly lower inner profile, meaning they rub an area of the disk not previously touched by a pad. That means new pad gripping on rust at the lower edge.
We will see what happens on the road!