You really should have those plates.
As I understand it the wheels that were intended to use them rely on them for strength in that area, the wheel centers themselves are not as thick as they should be if only flanged nuts were used.

I just saw 4 of those plates on some axles I have sitting around here. If I had any extra I'd send them, but I don't right now.

What I'm trying to say is I really think you need and want the plates, and they are out there and easy to find; go find some.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-