Old Husqvarnas are usually not too difficult to find spare parts for. Check with a stove shop nearby and they can help you.
If you switch to a new stove, you might have to do some masonry work, move the connection piece, and do some masonry/plastering on the sides if the new stove is smaller. It's not a tricky job, just make sure the connection is tight so the chimney sweep doesn't have anything to complain about.