how to replace the tail lights for mazda demio 1999 1.5l model

I've recently managed this on my 1999 demio. You need to unscrew the screw at the top of the rear light array (Philips-type screwdriver). This loosens the light array at the top, just enough for you to get your fingers behind it. Lower down, there are two lugs which secure the bottom of the light array. With a bit of jiggling the lugs will disengage, releasing the whole array - during this process, it feels as though the lugs are going to snap off!! Once the light array is in your hands, just twist the plastic holder of the bulb you want to change anticlockwise, remove the bulb (same fitting as a bayonet domestic bulb) and reverse the process to re-install. Hope this helps.
 
There are two plastic retainer do-hickeys on the hard that are made up of an inner circle and outer ring. Both of these are easily visible.

They are removed by first loosening the inner circle (probably moves back about 1cm), and then the whole do-hickey can be removed by gently prying the outer rings.

The hard vinyl still feels attached, so you can move it/lift it by hand until it moves over the rear release latch. This gives you enough room to operate.

The hard cloth (who's edge is covered by the vinyl) has two of those plastic retainer do-hickeys. Remove them too. Then you can access the back of the assembly/sheet metal.

Then there are three brass-ish long screws with 10mm nuts. Remove those three nuts, and you can pull out the tail light assembly.
 
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