My opinion is only replace the damaged one. The stock boots are by far superior to any replacements. Buy the Dormans but I would not worry about inner or outer, just get the one that is cheaper. Last time I bought them one was twice as much as the other and the only real difference is color, black or grey. Don't need a kit or anything. Just buy two boots (in case you mess the other one up in removal) additional CV grease, and some heavy duty zip ties. If you try and use the metal CV boot clamps, good luck. They take forever to get right, even with the correct tool, and then they might still decide to cut the boot, haha. I just use the HD zip ties and they have lasted longer and better for me personally.