Bowls which can fit the 'classic bowl-lift Kitchenaid Mixer' will also fit the Hobart N50. If you want to get a cheaper one, then you will be probably interested by some permanent offers on ebay (but get in mind that these offers are not about genuine Hobart parts).
About the hook, the C-shaped model is no longer made and now replaced by the spiral-shaped one. If you want to get it, you will need to ask to a restaurant equipment suplier, however, there is one offer on internet well-known by the N50 customers. (As I'm a new user, I'm not allowed to write the URL here ... I can mail you the link if you want)