Okay, I just got my set of MB Quart 6.5" separates, and I'm going to make 'em fit these doors, for sure. I also got a set of Kicker SSMB6 6.5" subwoofers, which I may install instead, if I can get more than 0.3 ft^3 and the requisite mounting depth, and locate the components in kickpanels...