Old Benjamin model c

My neighbor knows I’m into airguns so I agreed to fix up his old model c. I’m not even sure that’s what it is but it looks to me like it has to be an early model c. It’s missing the bolt at least. I’m going to reseal everything g and try dressing up whatever I can, even if it takes buying a parts gun. He’s adamant about trying to fix it up as it was his grandfathers. Is there anyone here that can point me in the direction for parts of assistance with these guns? I emailed mac1 but haven’t heard back yet and it’s been a week or two. I may try calling soon if I can’t figure out everything I need to order.
 
Couple places you can try calling:

Rick at Precision Pellet:
Baker Airguns:
JG Airguns: