I have a couple distributor machines and have spent much time rebuilding mopar dizzys. In my opinion the Hillman brand bushings should only be used in an emergency. They do not fit snugly on the undersized shaft diameter of the dizzy. The problem with the NOS ones are that the plastic is old. How long will it last? New under size ID plastic bushing material is sold at Mcmaster Carr. https://www.mcmaster.com/products/plastics/plastic~/shape~round-tube/id~1-2-2/ They offer many different types of material some material has under size ID sizes. If your handy you can make your own bushing.

Remember shaft end play. nm9stheham at For A-Bodys only said it best. "Be careful how you check the end play of the shaft; you can't check this from the top by pulling on the rotor or top shaft, because you are pulling on the mechanical advance plate and upper shaft, not on the main shaft. This needs to be checked from the bottom, with the distributor removed from the engine. With all new bushings and such, the main shaft will have an end play of the main shaft on the lower end of the distributor in the .007-.010" range". Less is better.