I’m intrigued by your question. I understand the early 411s used the same set up as the 410s - which were the last cars that parts lists were issued for, details can be found on this forum at
Resources - Bristol Cars - Owners and Enthusiasts Forum
So I’m wondering 1) what significant changes to the above set up were introduced on the
S5 411 as there is nothing resembling what you show in your hand in the above link, and 2) why grease nipples were deemed necessary anyway. The
front ends of the torsion bars are essentially permanently fixed once the ride height has been adjusted, so I’d have thought a smear of copper grease on assembly would be more than ample to allow for dis-assembly or adjustment. The latter certainly sufficed for the set up used on earlier cars so I’m thinking perhaps you don’t really need to worry about grease nipples anyway.