Ok so I recently purchased rear speakers and the magnet does not fit. I have read that you just hammer out the metal to make them fit. I also read it is not the wheel well so I can do this. Has anyone done this? I am afraid to hammer and break the plastic mount once the metal starts to bend or warp where the plastic mount's holes are so it will not go back in once I hammer it.

Also has anyone installed a Alpine KTP-445U? I soldered the speakers to the amp and connected the RCA's to the head unit but I do not know where to solder the head unit's yellow constant and black ground in terms of the battery, harness, and the amps yellow and black? It is just a 4 channel system, head unit, and battery. Nothing special (like tweeters and sub).

Thanks!