Interested in the hyper frame.
A. Do I need anything else or is it a drop in upgrade?
B. Classic valve compatibility?
After work I will lay out the old o rings along side the respective pieces of the on off assembly, and I'll lay them next to the new ones.
That ring is just for spacing between the o-rings, I don't think it matters if it is split or not, but I haven't noticed one that was solid.