Your search for "motor mount bracket" revealed the following:
1990-2005 Mazda Miata Transmission Support Bracket and Bolt
Regular price $24.45Used 1990-2005 Mazda Miata Transmission Support Bracket and Bolt
1994-2000 Mazda Miata Coil Pack Lower Bracket Shoulder Bolt
Regular price $4.45Used 1994-2000 Mazda Miata Coil Pack Lower Bracket Shoulder Bolt
1990-1997 Mazda Miata Headlight Bucket Driver Side
Regular price $30.00Used 1990-1997 Mazda Miata Headlight Bucket Driver Side ***this is an incomplete assembly*** photo is actual part
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