For headliners I normally go to my local hardware and lumber store and purchase a 4'x8' sheet of wall panel, frp, tileboard or whatever you like and trim 10" off of the long end. From there drill the holes for the center mounting pins and whallah - a brand new custom headliner and for under $20.
For floor mats we do offer from light line the factory front section of the rubber floor mat. They only come in black and retail for $195 plus shipping. Unfortunately the rear floor mat section is not available. We also offer complete carpet kits for Scout II's that cover both the front and rear section. Carpet kits retail for $395 and come in an array of colors.