Amazon.com: NuIth Speaker Wiring Harness Adapter 72-5512 Connector for 1989-2010 Ford F150, Lincoln Town Car Mazda Miata, Mercury Cougar Vehicles Aftermarket Door Speaker Wire Plug Replacement : Electronics
Amazon.com: NuIth Aftermarket Door Speaker Wiring Adapter Compatible with 1989-2010 Ford F150, Lincoln Town Car Mazda Miata, Mercury Cougar 4 PCS Speaker Wire Harness Adapter Connector Plug : Electronics
Amazon.com: Exact Fit Speaker Adapter Spacer Rings For Select Acura, Fits Ford, Fits Honda, And Mazda Vehicles 4.75" - Cutout - SAK056_475-1 Pair : Electronics
miata speaker mount" 3D Models to Print - yeggi
Custom Speaker Adapters - Compatible with 2005-2022 Chevrolet Corvette – Sounds Good Stereo Online
1990-1997 Mazda MX-5 Miata
5"x7" to 6"x9" low profile speaker adapter plate (NC Miata) by SpaceCoastDesign - Thingiverse
Aluminum Door Speaker Adapter Plates (ND Miata) – Paco Motorsports