Nice frame and strapping.
I have had a C2 (or "Jump") Ruck since 1987 and still use one. While it is getting harder to get parts, mine is complete as per the way I like it and have a few spares around. I have the 82 Pattern material bag for mine that Infanteer is speaking of and use the 82 pat Yoke as well, since the shoulder straps have the quick release. I'm not after originality but rather function and comfort. The youngsters refuse to believe that I can get all they have in their modern monstrosity into my l'il ole thang!!........until I show them!!
Let me dig around in my tickle trunk and see what I can send you. I may, repeat may, have an older version of the bag.