I can't find a page with the sub woofer, but to answer your question - No, you cannot use a 2 channel amp to power component speakers and a sub woofer. However, you could use the 2 channel amp to power the sub woofer (depending on the sub woofers voice coil) and power the component speakers off of your car's head unit. I would recommend investigating your brand selection more closely. What is available to you in your country?
I'm just going to hazard a guess here and assume that because that company offers so many prefabricated enclosure systems, that they are not very high end. What kind of budget do you have in mind? What kind of music do you listen to? What do you want to get out of the system? Are you using a stock head unit in your car? We need a little more information about your goals to help.
Maybe you can find brands like morel, dls, rainbow, or hertz? Or scanspeak, peerless, or vifa?
I know I've seen build logs in your region with good stuff;