I see. Mine (mostly the back seats, ironically, that have hardly been used [99.9% of the time its only me in the car]) have faded as its parked in the sun, the black cloth seats fading to a charcoal grey colour. On mine, I've got decide whether I should replace the front springs and dampers as they are (according to the MOT, though weirdly, not the service inspection) beginning to corrode (advisory). That could set me back quite a bit, and if I recall, I won't be able to use Mazda OEM parts as they don't make or stock them for the gen-1 car any more.
I'd need to make sure they are Japanese-made (or to Mazda's specs) as apparently European-made springs have been known to prematurely fail as the ends aren't properly smoothed off, and some have had structural defects because they were moved out of the foundry into very cold air (Sweden) too soon after being cast/shaped. Hopefully I won't need to make that decision for a year or two, and I would hope by then my career situation is sorted and I can either afford to do this or buy another car. I never like leaving wearing parts on the car for too long if I can help it.