1966 Pennsylvania Meteor

Hey there I have a 1966 Pennsylvania Meteor. It is the hydro version with a snow plow. I have read that this model with the hydro is very rare because they were so expensive back then. It starts and runs great, but is getting a little slow moving in the winter. Anyone know of a shop or anywhere that could rebuild the hydro pump for me? Also is there an original "wide" seat out there for sale anywhere?
Any help appreciated