Radio Swap Help

Alright, so i got a 98' Millenia couple of days ago, and it still had its stock radio installed. I changed the front and back speakers, and wanted to install a sub with an amp. After one day of painful radio removal i found myself stuck with another problem, I could not match up the wires, and, after i spent half a day trying to find wiring diagram on internet, i gave up. So i'm asking if there is anybody out there that already went through the whole process and is willing to help. I'll be very greatful. THanks in advance.

nevermind ladies, got it

i have a 1995 mazda millenia i was wondering what kind of wire harness i need also did you bypass the amp

i didn't use a wire harness at all, i just connected wires one to each other. Mine is not an S model so i don't have a Bose system which luckily allowed me to change my stereo without messing around with amps. i heard a lot of people that own an S model just rewired the whole car, which is not that bad. if u need a wiring diagram let me know