Car speakers and creating a crossover

Hey everyone! I’m wanting to swap my speakers out in my car with some Dayton audios

I have currently swapped out focals for JBL GTO components as one had a blown tweeter anyways

I’m running a PPi 900.4
Channels4 ch. Class D
RMS Power 4Ω145 x 4
RMS Power 2Ω225 x 4
RMS Power 4Ω Bridged450 x 2
and I run deck power for my rear speakers which is 50 watts peak

I’d like to get some Dayton audios and a tweeter problem is
I need a passive crossover, I understand by using DSP I’ll get better fidelity but I also am using my rear bridged Channals of the amp to bridge for a sub

So I’m limited on inputs and outputs and want to stay passive

Can anyone help me with designing a passive crossover ? Or teach me and explain how I can create a butterworth filter (at least I believe what it is)