Amplifier for Philips HTS7201/HTS7202
Those speaker connectors are Mini Easy-Fit Speaker Jacks and they are proprietary Philips, so probably not for sale and they won't connect to anything else. You can easily cut them off and put on connectors of your own choice though, as long as you get the polarity right.
As for an amplifier, you need one that can drive 5Ω speakers with a power rating suitable for the speakers, and has a subwoofer connection that can drive a 3Ω speaker. There aren't many power amplifiers around with a power subwoofer output though, but Google will probably find a few.
You could also leave the subwoofer out and just use the other two speakers, and get a simpler and cheaper power amp.