I searched and couldn't find anything, where's the ideal location for mounting the crossover for a set of component speakers for the front with Mach 460 setup?

 

i have a 97 GT as well, and I mounted the x-over's behind the kickpanels.

tight fit, but it worked

 

The kickpanel is a great spot but time comsuming b/c you have to run the wires throught the boot of the door. I found if the crossover isnt to big to mount it above the midrange about 3 to 4 inches up and about 1 to 2 inches below the tweeter.
or
Also if the crossover is bigger, then you can look at putting the back further on the door. Its hard to explain, but when you have the door panel off look at the door panel right where your arm rest is. You will see some yellow foam cut a little bit off a now kinda of judge where that meets the metal frame of the door with the panel on and screw it in there.(mount it there check to make sure it is clear of the tracks for the window)

When you mount the crossover just mount it first before to run away speaker wire and put the door panel back on to make sure the panel goes on without the crossover getting in the way.