I have been working on a speaker solution for the 914 since I got it. Ran across these Swiss Audio component speakers a while back, but now they are on sale for only $89. For some guys this might be a nice set up. It's an unusual 3-way component kit that has a 4" mid and 5.25" woofer. If your doors have been cut for existing 5.25" you could install these in the doors and then mount the tweeter and the 4" behind the stock plastic grilles.
http://www.woofersetc.com/p-8837-sac-525-s...ent-system.aspx