This guy is selling more than you need. Looks like rockers, balls, studs and guideplates; 4 each.
Ad is a bit ambiguous, but you might contact him to see exactly what he has.
https://www.ebay.com/itm/70-80-CORVE...frcectupt=true
Then there is this guy who says he has a set of four studs that he will list if you request.
Might contact him as well.
http://vi.vipr.ebaydesc.com/ws/eBayI...1&secureDesc=0
I am 99% certain I have a set of 16 squirreled away, but I wouldn't want to break up the set of 16.
Good luck.