bladest

Hello people i have Sony MEX-XB100BT unfortunately all the accessories missing
the most important thing which i cant find is
Picture 7 of 14 for Sony MEX-XB100BT Stereo w/ Built-In 160W Amplifier!
this box with fuse and i dont know whats more inside ,
sony asks for extremely high price
approximately 100$ for this cable thats nuts!!?!
whole radio + accessories 2nd hand cost that amount or i have seen it on ebay action for like 80$ working,
can someone tell me whats inside this cable box and how i can wire my radio,where i can get that box at good price or , can someone make it for me please tell me.
I really like the radio but i cant use it for now no cable...