I would replace the discs first at that age, you won't find cheap copies as they are MMC specific
If you still find you have some runout, (sometimes felt as a slight oscillation when brakes used gently) the only really accurate cure is to skim on the car because Mog hubs aren't the most accurate
I can recommend Melvyn as he had made an adaptor to drive the splined hubs with the skimming machine & it transformed the previous Roadster issues we had
