How hard to fit 5x7" into 4x6" and 6x9 ?

[Alexs]

As the subject says I could get 2 pairs of this speakers, but my 1995 Oldsmobile Cutlass Supreme takes 4x6 on the front and 6x9 on the back.

How hard do you guys think it will be to fit those in ??
Is it worth it?

spkrs (http://www.epinions.com/614135_Alpine_5x_7_2_Way_Speakers_SPS_5729)

[guysmiley]

it would be easy to fit them in the rear, all you need is a thin piece of wood with the right size hole to mount them on.

the front might be a little more tricky, they might not even fit if you could cut the hole bigger