A 55-year-old patient requires a denture. Objectively: Kennedy’s I class dentition defect; the 16, 17, 18, 26, 27, and 28 leeth are missing. The patient presents with fixed occlusion. The 15 and 25 teeth have low crowns with poor anatomic contours, intact. Clasp-retained (bugel) removable partial denture is being made for the patient. What fixation system would be optimal in this case?