3.5 inch speaker cup for NA Miata

thingiverse

I wanted to replace the speakers in my Miata, but it's difficult to find the odd rectangular speakers that are any good. So I bought these nicer round speakers, but wanted to keep the acoustic box they were in to retain the same affect. This is the result. I'm pretty happy with how they turned out. I have since rotated the lower screw tab a little counter-clockwise, as you can see in the picture that the speaker screw hole doesn't line up perfectly.