A while ago I had upgraded from factory speakers in my ride to Polk speakers, then subsequently upgraded two of the Polks to a larger diameter, leaving me with two unneeded coaxial drivers. As they are coaxial (meaning there is a tweeter in the middle of a midrange) and have a capacitor to cancel sounds below 80Hz, I shouldn’t need any crossover network. I found some 3D printable files for 3” speakers and scaled them up to 4” size.
@MookyTroubadour lime green