Is this going on a truck?
Look up the correct Datsun/Nissan part #on
http://www.olddatsuns.com/620tech.htm if it is a truck and the check the number with nissanparts.cc
http://www.nissanparts.cc/
It is best to call in your order as the internet parts lists need up dating for availability.
If they are no longer available from Nissan then check with Moog.