Little Mach 460 Install help

Ok I got all the parts and wires needed to complete my Mach 460 system install. My only question is on the Front harness by the radio the Mach 460 harness has 2 extra plugs, both being male. These I assume are for power, but On my 99 stocker I cant find the plugs anywhere to plug them in, The old harness disconnects from 1 smaller plug that doesnt go to the mach one at all. Does anyone know where these 2 plug connect at? Dont have a pic of mine but here is a pic i stole off ebay

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The two I am refering to are in the middle bottom of the picture, one black the other grey. All the connectors mach up to something except I cant find these, any ideas? did 1999 change because there is that one plug that the old harness connected to.

Ok, i figured mostly what to do, Now the back rear deck box works, but the front speakers/ none of the tweeters work at all. THe plug that goes into the back of the radio went into one of those plugs that i was confused about, but now im still stuck with the one plug and no idea what goes into it, its almost the same plug as what goes into the back of the radio but there is like a notch on the other side. in this case the BLACk plug that is in the very middle still is sitting around because i dont know what to plug into them.

Red2000GT said:

I thought the black one goes into the cd player and the grey went into the cassette/radio.

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Well basically when you get a mach 460 wirring harness it plugs into the old harness, The old plug that goes into the back of the radio plugs into the grey one and the black plug which is almost identical except there is a notch that would prevent it going in. There is no plug on the cd player for this.