Decided to try the Morel CCWR254 in my door card. Quite happy so far with the SI M3 in Valicar pods, but this setup is more stealth, places the mids wider and nearly in-line vertically with the sail tweeters. If I'm blown away by the Morels I'll keep them in place and sell the M3/pods, although this may also be a test run for placing the M3 in the card. Picked up a pair of extra door cards from an auto wrecker, so I can mar the cards up with impunity. Covered the area in masking tape to avoid the having the (I guess vinyl) outer wrap from tearing, and used three increasingly larger drill bits to create a guide hole for a 2 1/4" hole saw. Slowly ran the hole saw in reverse with low pressure and it worked great. My plan for now is to simply have the back wave dissipate into the space between the card and the door surface, although I'm open to making some sort of sealed chamber behind the card if that seems warranted. Pretty much perfect fit as far as the diameter goes - the problem is that the surface has a curve to it, so the driver doesn't sit flush to the surface, as seen in the last photo. Unsure of the best way to get that gap filled and sealed. I'm OK with screwing the driver directly to the card. I can also make a cutting board ring, although that wouldn't solve the issue. The current angle wouldn't be too bad, but also open to a solution that would get the driver more on-axis on the driver side. The passenger side I think would be pretty much on-axis from the driver's seat. I'm thinking perhaps some rubber weatherstripping cut to compensate for the gaps? Any advice on what material/technique would be appropriate?