I am buying some 5-1/4 Components and I don't have the stock speaker mounts. How could I mount them and where to get good sound? I need to make something myself, like some sort of box or something. And where could I mount it? Any ideas?

 

Oh, and this is in my FD.

 

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some 5 1/4 fit in the bose mounts and make a nice sealed box. I see in your sig you removed yours. If they are gone (thrown out) a new set should be pretty easy to find. Aside from that, this might help:
http://www.rx7city.com/93_speakerinstall.htm