iPod iPod docking cable

[mikeni92]

I'm installing an ipod connection in my glovebox. I've already wired a 3.5mm jack and a DLO charging cable into the glovebox, but I'm looking for a wire that can combine these two wires into one so they don't tangle. I know that apple's dock can do this, but does anybody know if anyone makes just a cable that does the same thing? Thanks.