Genuine Mazda part.
This handy little pocket comes standard on NB8A models but can be installed on NA and NB models when installing aftermarket stereos to fill the gap
This can fit in most single din holes HOWEVER it will not install in the NA6 89-93 factory tombstone.
If installing an aftermarket stereo into an NA6 89-93 we recommend purchasing a NA8 94-97 tombstone surround panel.
You can determine what tombstone panel you have by seeing if you have a recessed edge for the pocket to 'clip' into