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[Darth Loo-knee]

The EB backing plate is for the earlier v6 engines. Where for the lower idler (to the side of the water pump) there is a sticking out threaded section for the idler to sit on. On the later engine this protruding section is not there so the big washer is needed.
As to your question.... if on the earlier engine you did not fit the "washer" then the idler would tighten up against the back plate and wouldn't spin.