seals for benj.317 ,schematics

I have got a benjam franklin model 317 in .177 made around 1957.Someone has taken the seals off the pump rod n maybe something else ? I need to find a place to get a schematics to see just what else maybe missing.I also need to know where to get the parts ,seals for sure . Might someone know where to buy these items .I have not had any luck finding these. I would be thank full for some suggestions . Terry at [email protected] Thank you for the help !