5"x7" to 6"x9" low profile speaker adapter plate (NC Miata)

thingiverse

This adapter plate enables you to install 6x9 automotive speakers in place of 5x7, making it universally adaptable but specifically designed for the NC Miata. - This adapter plate attaches directly to the mounting surface of the 5x7 using its inner set of ears as a guide to mark the cut line. - Before attaching the adapter plate, pre-drill all intended mounting holes in your stock plastics. - Once marked and pre-drilled, remove the adapter plate, cut out the material inside the marked lines, and smooth the edges. - Cut off and discard the 5x7 mounting ears. - Replace the adapter plate using the pre-drilled mounting holes and secure it with adhesive (superglue). - Install the 6x9 speakers in the appropriate mounting holes once the glue has set. Another file with added strength/height will be uploaded at a later date, but please note that this design is not intended for commercial use.