Although I prefer to keep things original*, my final repair/improvement job on the MX-5 Mk2 (which will now run problem-free for the next ten or twenty years, Scouts' honour) was replacing the original arm rest/console, which had a rubbish floppy hinge and no cup holder with one from the later MX-5 version Mk2.5, which has a proper solid hinge, a slightly deeper cubby hole and two cup holders. The rear one is even specially shaped so that it will take a mug with a handle:
* The original one is going in the shed 'in case I ever need it'.