The above is a good explanation of accessing the mirror but to answer your question directly, yes, they will fit. All the 90-97 mirrors are interchangeable with the exception of installing later power mirrors onto a 90-91 Miata where it wasn't a factory option. They will mount up fine but do require enlarging the center hole where the wires need to run.
SOURCE: How do you replace Miata side door mirror
Hi,
Open the door of your Miata and locate the three screws in the door
panel. The first is located in the trim plate where the door handle is.
A second lies below that inside the grab handle on the door. The last
one is found in the upper end of the door handle.
Remove the three retaining screws on the door with a Phillips
screwdriver. Locate the three push in retainers on the panel. There is
one on the face of the panel near the upper front corner and two in the
rear door jam.
Lift the center of
the retainers with a flat tool or small screwdriver. Pull the door
panel out from the bottom. Lift the panel out of the window track and
move it out far enough to access the wiring behind it.
Remove
the electrical connectors for the window and door locks by unplugging
them from the switches. Unplug the wires from the door speakers and
remove the panel. Set it aside.
Locate
the wiring connector for the mirror heater and adjustment motor. Unplug
it from the wiring harness connector on the inside of the door.
Turn
the mirror on your Miata sideways to reveal the two mounting bolts
inside the base. Remove the bolts with a socket and ratchet. Pull the
mirror off the body, fishing the wires out of the hole in the body.
Best regards.
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