Well not every part.... But damn near every part. The Long 550 is not a bad machine. The power steering, 8 speed transmission, and independent PTO will be pure luxury compared to the bare bones 8N. The Long 550 was made in Romania, however some parts might be getting hard to find for it. Its a risk on parts availability. I would be hesitant to upgrade, given the durability and parts availability of the 8n. However it really depends on how many hours your putting on the 8N a year. For me parts availability is key, as its assured things will break.