OEM part numbers : 6648820, 6630186. Bobcat SKID STEER LOADER: 743DS. 743B, 743DS: w/ Kubota Diesel Engine. Bobcat SKID STEER LOADER: 645. Bobcat SKID STEER LOADER: 743 (S/N 15001->). Bobcat SKID STEER LOADER: 743B.