Your search for "motor mount bracket" revealed the following:
1990-1997 Mazda Miata Evaporator Charcoal Canister Bracket B61P-13-960A
Sale price $24.45 Regular priceUsed 1990-1997 Mazda Miata Evaporator Charcoal Canister Bracket (Color May Vary) B61P-13-960A
1999-2005 Mazda Miata Door Speaker Bracket NC10-66-890B
Sale price $20.00 Regular priceUsed 1999-2005 Mazda Miata Door Speaker Bracket NC10-66-890B
1990-1997 Mazda Miata Right Passenger Lower Radiator Bracket B61P-15-240A
Regular price $34.45Used 1990-1997 Mazda Miata Right Passenger Lower Radiator Bracket B61P-15-240A
1990-1997 Mazda Miata Battery Tie Down Bracket NA01-56-03XA
Sale price $24.45 Regular priceUsed 1990-1997 Mazda Miata Battery Tie Down NA01-56-03XA
1990-1997 Mazda Miata Diagnostic Port Bracket NA05-67-BW0A
Sale price $3.45 Regular priceUsed 1990-1997 Mazda Miata Diagnostic Port Bracket NA05-67-BW0A
1994-2000 Mazda Miata Coil Pack Bracket
Regular price $15.45Used 1994-2000 Mazda Miata Coil Pack Bracket *** Bracket Only ***
1990-2005 Mazda Miata Front Sway Bar Bracket FB01-34-155
Sale price $2.45 Regular priceUsed 1990-2005 Mazda Miata Sway Bar Bracket FB01-34-155
1994-2005 Mazda Miata Intake Manifold Brace Stay w/Bolts BEP8-13-121A
Sale price $9.45 Regular priceUsed 1994-2005 Mazda Miata Intake Manifold Brace Stay with Bolts BEP8-13-121A
1999-2005 Mazda Miata NB Power Steering Pump
Regular price $24.45Used 1999-2005 Mazda Miata Power Steering Pump Bracket, Bolts and lines sold separately.
1990-1997 Mazda Miata Driver's Side Left Power Window Regulator
Sale price $75.00 Regular priceUsed 1990-1997 Mazda Miata Driver's Side Left Power Window Regulator