These fiberglass doors are lightweights and very strong with the incorporation of an inner layer of foam core that is included in the composite lay-up. Doors fit '65 through '98 model years (911 through 993). The inside of this door is a closed style and is very sturdy. These doors include the window frame and mirror housing (No mirror or hardware is included. See GT Racing Part #18M for the mirror). Door hinges are NOT installed into the doors. Use stock hinges or GT Racing Part #20. GT Racing Also recommends the slider style windows for these doors part #62G evo. Doors are sold in pairs and average weight is 8-9 lbs each.