Do you know if they make interfaces for alpine/toyota?

I was thinking about calling someone local(a co. alpine 1 recommended) and she if they can do something in re to either interfaces or rf,etc. I just don't want to get ripped and then they tell me they can't do anything to make it work. The guy who previously owned obviously made it work. cuz he once had some pretty big speakers in back, and took them out before he sold the car!

but the car ran so good at 1400 I could not go wrong buying it. It runs like a top interior still in excellent conditon and outside. just tryin' to figure out the damn cd changer he once had it hooked up cuz I can see all the wires that he hooked it up to, just don't have the know how to hook them up! Phyl