LittleBeast, excellent job with the photos and cataloging of the process. Same to all others who've tackled this job and contributed. I'm going with Polk 2-ways (DB651)for the rear. I figure the sound stage is mostly up front anyway with my Polk Components (DB6501), and if I haul around little passengers, tweets won't be right in their ears.

I read most who do this job go with shallow-mount speakers. I'd really PREFER to go with the non-shallow Polk DB651 for better driver excursion due to the already-limited bass response in that "free-air" location. I know the magnet depth is exactly the same for both Polks 2-way models (slim vs. non-slim), but not sure if the tweeter height on the non-slims will make it under the stock panel grills.

Any insight into this, measurements for distance between the speaker mounting plates and the outermost convex curvature of the stock grill once installed... or general opinions about the sound of the Polk DB651 vs. DB651s? (I know this mod means 6.5's" would be mounted a bit higher than the stock grill's center.)

Excellent forum... & much grass.