In this section you can see some pictures of the correct installation of my speakers... 

Because the speakers are so big, and the holes in the metal of  the OEM speakers so small... I had to use an angle grinder to cut the metal and make the holes bigger to accept the size of the new speakers.

After that, I made the holes in the fabric,  and then I made the holes for the bolts with a drill.

It sounds pretty easy but its very time consuming, specially  cutting metal without burning everything around with the sparks...