Thanks to NYJeff
http://deabath.com/Obsolet_Crane_Fct...crane_fct.html

Which states-
Crane Dial-eze Kitchen Faucets with Plastic plate:
Some Crane kitchen sinks used a large chrome plated plastic faucet mounting plate over a large rectangular hole in the sink.
We can cast a new mounting plate from solid brass for $950. Faucet repair options are same as for the above sink.

Jack