Head & Base Gasket Set (62mm) for the 177.3cc Engine , fits the Vitacci model(s) listed here as well as some other makes/models. Bolt spacing = 60mm center/center to the adjacent hole and 81mm center/center to the diagonal hole. NOTE: Please be sure you need the gasket kit with the 62mm bore and that your bolt spacing matches ours prior to ordering. Some models may have used a different bore.