New holding tank
Yes I replaced the entire system from toilet to the holdong tank on my proevious boat, a 310. I don't remember where I got the new tank but it was a stock unit form West Marine or one of the other supplier. I got one that was a close to the original as possible and the fit went very well. New tank, fittings and hoses equated to no more leaks or odors. A muchhappiercaptain and wife. The toilet was replaced after the fact since the pump like to fail too often. As I recall there was adequate room to work and the hose runs were short. Go for it.
Mike