I have a stainless steel undermount sink with granite on top.  One side of the sink is smaller than the other, so the granite has a slight curve at the top of the sink.  Unfortunately Moen didn't consider this very popular sink style, so there's no metal plate included that would fit my situation.  Just a 3 hole cover.  So I will be returning this faucet.  Seems pretty obvious.  I searched the website for a part that would help me keep and fit this faucet, but the website has no pictures for any of the associated parts.  Since I can't tell what I'm going to buy, I can't solve this problem.  Not sure why they'd NOT put pictures with their parts, but it's not my problem anymore.  It's a return for Moen.