3.5 inch speaker cup for NA Miata

thingiverse

I wanted to swap out the speakers in my Miata but struggled to find odd rectangular speakers that truly impressed me. Instead, I purchased these nicer round speakers and decided to keep their acoustic box intact to retain a similar sound. This is what happened next - I'm quite pleased with how they turned out. Afterwards, I adjusted the lower screw tab by rotating it counter-clockwise slightly, as you can see in the accompanying picture where the speaker's screw hole doesn't line up perfectly.