TR2/3/3A Revington's Rear Spring Locators?

[karls59tr]

These are "four special washers to prevent movement of the rear springs" RTR3059K
They look like larger versions of the stock washers. I'm in the process of replacing the rear springs in my 3 and was wondering how much of a benefit this upgrade would be for the front of the spring? I already have the Delrin bushings at the rear of the spring.
I wonder if a local bolt supply house might have these washers in stock.....but they would probably not have "D" type center hole?
Any thoughts?:eagerness:

 

[TR3driver]

IMO, no benefit at all unless you plan on making other changes and really thrashing the result. They might reduce movement of the rear axle very slightly, but you'll never notice in normal driving and most of the deflection happens in the spring. Revington sells a lot of racing equipment without really explaining what it is.