Factory Amp.

I have a 96 G20 and im looking for a wiring diagram for the 2 factory amps.
Anyone know where I can find this??
I also need to find a site that sells factory parts, ive been looking for a rear bumper for some time now.
Most places wont ship here and the ones who do charge more for the shipping than the bumper.
I live in Canada.
Im also looking for clear side markers??
Im not sure if thats what they are called but they are those 4 pieces of plastic, 2 orange coloured ones in the front and 2 red ones in the back.

Any help will be appreciated.

Thanks.