Keith,
You don't have to have a PTO unless you are going to use it. Block off plates can be found or made easily and 'problem solved'.
All seals are identified by ID, OD, width and lip style. There are bazillions of seals made and almost all are available somewhere. If you don't have a need for the PTO, block it off and deal with it later.
You probably aren't' being milked, the guy is doing it the only way he knows how, with the correct new parts. It's his reputation that is at stake.
Stuart
