1970 nova suspension option?

[Mr70]

I've noticed in the early released Chevrolet price books,ordering guides and catalogs,they stipulate that when the 1970 basic RPO Z-26 SS Nova was ordered with the standard 350/300HP engine,the F-41 performance suspension was NOT included or available,and of course neither was the F-40 suspension.
But at the same time,when you upgraded that same dog tracker with either the L-34 402/350HP,or L-78 402/375HP engines,you now automatically received the F-41 performance suspension package too.
Later dated materials reflect that the F-41 performance suspension is now standard on ANY 1970 Nova Super Sport,regardless of engine installed.
Has anyone seen physical evidence that reflects this on the earlier built Super Sport Novas?