09 Civic; splitters for rear audio connector?
 

[I also posted this in the tech talk area but this area looked on topic as well]

I have a 2009 Civic. I also have a high end subwoofer setup that has gone with me in my last 3 cars (I'll never sell it, I made it custom for the speakers).

I'd prefer to leave the stock connectors in place so if I ever sale the car I can easily remove the box. Therefore I'm looking for a splitter for the grey-ish molex-ish plugs that connect to the rear stock speakers so I can run a second set of audio inputs to my amps.

Q1. What is that plug style called?
Q2. Is there such a thing as a splitter for it?
Q3. Where can I order one?

TIA