Going from Aftermarket Headunit to Stock Mach 460 Headunit

I just bought a stock Head Unit for my Mach 460. I do not like my aftermarket head unit and prefer the stock radio look.

Any information on how to revert back? It appears that when installing an aftermarket unit you have to splice in new connectors...I'm wondering if I now need a stock harness/plug for the stock unit?

I haven't taken anything apart yet just looking for some information as I tackle this in the next few weeks.

The current head unit is an Alpine of some sort.

This will be an easy swap for me. PO used an adapter harness that the stock plugs plugged into. My stock radio should be here tomorrow. Here are some pics of what the setup was. I'll have to add this to my build thread along with other minor things I did this week.