sorry to hear about your medical issues
now the reason i make a post like this is to help others also
with Crosman parts they have a 3 number starting number that is the model the part was first used and in this case 2 of the Orings are 130-34 and 130-35 those would be simple to find but the Oring are worth less than $0.20 and people will charge 10 to 20 times that
the stem is 1322-a011 and that was used on the variant 1322 model first and the part 1322-056 the check valve
and there is the piston cup 760-140 first used on the 760 rifle at some point
now you never state the problem
now i am surprise these guns don't have wipers for the cylinder and you just add oil to the piston cup itself
a dry cylinder would make this multi and or SSP gun not function