I purchased an inside light blocking privacy curtain from"EASY CURTAIN", (323) 757-2207,
www.easycurtain.net. It cost $99.25 including shipping. The curtain is black. Installation is simple: 1. Slip curtain pockets over interior visors and tuck curtain around windshield. 2. Lower window approx 2". Place a small flap over top edge of glass and raise window back up. Press along a velco strip to complete assembly. It takes less than two minutes & definitely keeps out all light. "Part # 70-4200 International 4200 Gulfstream Motorhome". I highly recommend this item.