hi m8, if ive read your post right, you say your head unit has nowhere to plug your amps rca leads into, so if you want to connect them you cant simply cut the plugs off

(this would just knacker your leads) to connect your amp you will have to sacrifice your rear speakers m8, because you need to fit a device that your local audio supplier will have or can get that wires to your rear left and right speaker wiring and converts the signals on a circuit board attached to rca connectors that your amp leads will connect to, dead easy to do just four wires to connect to speaker wires from head unit and plug rca's into sockets on end of the new wires.

dont have rear speakers in my 2 and dosent really affect sound to much as my two 12" subs would drown them out anyway, if you want to do this and cant get a connector or audio place is unsure what you need i have a spare one from an earlier install, in working order i could find out and post you for a small cost to cover postage, hope this is of some help, if ive missunderstood your post, then ignore this post and the fool that wrote it

!

, jim