This is the Metra 99-7526B 2014 - Up  Mazda3 Single  DIN Kit.

This stereo installation kit has been engineered to help you install a 2” tall (Single-DIN) aftermarket radio into the original vehicle dashboard. This dash kit makes radio replacement simple and comes with a pocket that is installed below the 2” radio to fill the extra space in the radio opening, which can be used for storage. The dash kit is painted scratch-resistant matte black to match the original look and feel of the vehicle’s dashboard. Installing an aftermarket radio can upgrade the sound quality and provide additional features the original factory radio couldn’t offer but requires this dash kit to make it fit.

• Stereo installation kit designed to fit any standard 2” tall aftermarket radio
• Painted scratch-resistant matte black
• Made from the highest quality ABS plastic for an original factory-like fit and finish
• Includes brackets and hardware parts needed with detailed installation instructions
• A tech support number is available for installation help 7 days a week

Wiring and Antenna Connections:

Harness

• 70-7903L (without amplifier)(sold separately)

Antenna Adapter

• 40-HD10L (sold separately)