While it might look similar the 500 should be different. That is a nice truck. Once up and running treat it gently. Parts are very hard to find. 500 series are kind of in a world of their own. 400 is lighter and 600 is heavier. A lot of 200 to 400 parts are the same and 600-800 a lot are the same. 500 just seems to be in the middle.