If you are somewhat good with your hands, the best solution is to contact Ken @ Musicar Northwest.
His kits include EVERYTHING required to install the system (all connectors, etc - NO cutting or fabrication required).
Yes, the price is steeper than what you will find on the back page of the sports section, but they are proven to work well. In life, if it seems too good to be true (low price), it is.
Rather than spend a little to get a slightly less crappy sound, save for a couple of months and then get something that you'll truly enjoy.
Just my $0.02.