Your
Miata is a classic, but the design of the dash makes it difficult to
replace the radio. Metra's DP-7528 dash kit replaces the center dash
panel and allows you to install an aftermarket single-DIN (2") or
double-DIN (4") stereo in select 1990-93 Mazda Miata vehicles. The
panel's black textured finish matches your factory dash.
Metra DP-7528 Dash Kit owner's manual