Speaker wiring - help needed

[Ronin001]

I attempted to upgrade my audio system today and got somewhere but not complete.

I've got non dsp, non nav, and taken the outputs at the radio and wired them through LOC (Rockford 3sixty - for eq purposes later) and into my amp (I don't have a OEM amp).

From the amp, i connected the speaker wires back to the point where I cut the wires (from the radio). Strange, but the OEM tweeter in the dash still works, and my highs are being filtered.

Would like to run the speaker cable through the doors but not sure how to do so. Has anyone upgraded their speaker cables from amp to speakers in the door?

If not, where do i find the OEM crossover?