metro as in GEO METRO wiring kit and harness? im not sure about that may not work but miricles happen....and for the 6th speaker...you would pretty much copy what they did for wiring the other speakers...+ in + and - in -....here somthin from
www.the12volt.com its 2002 but im sure its similar if not the same
12V|white/red |+ |ignition harness |
| STARTER|black/red |+ |ignition harness |
| IGNITION|dk. green |+ |ignition harness |
| ACCESSORY|blue/red |+ |ignition harness |
| SECOND ACCESSORY|blue/black |+ |ignition harness |
| POWER LOCK|lt. green/black *2 |- |drivers kick panel *1 |
| POWER UNLOCK|orange *2 |- |drivers kick panel *1 |
| LOCK MOTOR|lt. green | |drivers kick panel *1 |
| UNLOCK MOTOR|dk. green/red | |drivers kick panel *1 |
| DISARM DEFEAT|blue/black | |passenger kick panel or *9 |
| PARKING LIGHTS +|grn/wht or pnk/blk | |low in drivers kick |
| HEADLIGHTS|orange |- |headlight
relay under hood |
| DOOR TRIGGER|green/yellow |- |fuse box *8 |
| DOME SUPERVISION|green/orange |- |fuse box *3 |
| TRUNK/HATCH PIN|red |- |drivers kick panel *7 |
|TRNK/HTCH RELEASE|green/white |5wi|drivers kick panel *7 |
| FCTRY ALARM ARM|arms with lock | | |
|FCTRY ALRM DISARM|disarms with unlock | | |
| DISARM NO UNLOCK|*6 | | |
| TACHOMETER|*4 | |*4 |
| SPEED SENSE|white/blue | |center console *5 |
| BRAKE WIRE|green/orange |+ |brake pedal switch |
| HORN TRIGGER|lt. green/black |- |steering column |
| WIPERS|blu/org & blu/yel |+ |wiper motor |
| LF WINDOW UP/DN|red/blk - grn/blk |A |drivers window switch |
| RF WINDOW UP/DN|red/wht - green |A |drivers kick panel *1 |
| SUN RF OPN/CLOSE|not recommended | | |
| RADIO 12V|orange/black |+ |radio |
| RADIO SWITCH|white/black |+ |radio |
| RADIO ILLUMINATE|green/white |+ |radio |
| LF SPEAKER|wht/blu - blk/blu | |radio |
| RF SPEAKER|wht/red - blk/red | |radio |
| LR SPEAKER|yel/blu - gry/blu | |radio |
| RR SPEAKER|yel/red - gry/red | |radio |
Notes: NOTE: This vehicle is equipped with an immobilizer. *1 Located in a black 32 pin plug. *2 These are the door key cylinder wires. Meter the wires while turning the key in the drivers door. Unlock requires a double pulse. On vehicles without the factory alarm use purple for lock and lt. green/red for unlock, these are the
door lock switch wires. *3 In the plug on the upper right side of the fuse box unde