What I have: a pressed board siding covered with 1/2" foam insulation and vinyl siding on top. I'm about to replace my front door with the prehung unit that has the brick molding. Walls are walls are 2x4 construction. My concern is not only the door frame depth but also a depth of the brick molding. If I cut vinyl-foam-board siding all the way down to the sheeting, the door is going to be too deep down. As far as the inside goes, I guess I could always use an internal jamb extender or drywall return but isn't a placing of the brick mold all the way down to a sheeting the right way to do it? Does anyone know the right way do this? I've installed a few doors in my life but never had to deal with the double siding issue before. Thank you in advance

Does anyone know a website where I can replace my older 1950 door knobs and latch mechanism? I want the same look but the springs have given out somewhat inside the latch mechanism and the knobs don't spring back after turning them. It's the kind of knobs/latch where just a small hole is drilled into the door. Thanks