Raz, I have a template I made from an original set of factory installed speaker kickpanels in PDF format I could send you:
http://pg.photos.yahoo.com/ph/brettliukkonen/detail?.dir=3ea4&.dnm=4dc0.jpg&.src=ph
(This is a smaller image of it on line)

Send me your email, and I'll send it to you. Yes, the main thing you need to watch is the depth of the speaker. But if you use original style grills you mount the speaker from the outside of the panels (on top of the panel) as the cover has about 1/4" depth.
http://pg.photos.yahoo.com/ph/brettliukkonen/detail?.dir=34b2&.dnm=d04b.jpg&.src=ph

Let me know!

Brett - 67 Drop Top 455! (with friends in Highlands Ranch)
brett@cisdirect.com (wrk)
brettnheather@hotmail.com (hm)