Most pre-cut wainscoting isn’t going to match a home of that age. You can get beaded tongue & groove panels or board & batten and make your own. The height usually started at 4 feet and went up to 6 feet. If your home is a Craftsman, the wainscot should be more of a shaker style, with straight lines and flat panels. Victorians have a little more ornate style with raised panel and decorative moldings.