Now to address your questions more specifically. The bolts that hold the mounting plates to the rear end are standard metric bolts, grade 8, I think. It's a good idea to start with new bolts, as you suggested.
The 48 backhoe is run off the power beyond at the rear end. You'll need that kit. Are you sure that your rear remotes are not power beyond? Does the tractor have a hose that plugs into one of those fittings?
The 48 backhoe is run off the power beyond at the rear end. You'll need that kit. Are you sure that your rear remotes are not power beyond? Does the tractor have a hose that plugs into one of those fittings?