I put the pump in my tractor. I have extra parts laying around but I use my tractor weekly so I'm going to keep most of them as it's my only tractor. But once you get yours apart and figure out whats wrong with it we might be able to work something out. I do have a complete seat and assembly but it's pretty wore out. I would sell it the way it it or restored. 

  One thing I would recommend doing is start watching ebay, you will get a good idea as what used parts cost but in the summer you won't find much on there but winter there is always parts listed. I was able to buy several pumps and rebuild kits cheaply. 

 I'm on vacation but will call or email you more details later this week.