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I recently picked up another C4 (95) and as always recommended a FSM is a must, so I found several.
So I found someone selling a set of Volume 1 & 2 both with Red covers but there seems to be a third possibility also available there's a 3rd FSM white cover does this cover a specific section
I think I found the difference the White book is replaced with the 2 Red FSM
Whites are 'preliminary' and are NOT complete for the year.
Another option is the .pdf and if that would make you happy I can help. PM or email me for details. Many with 2 volume 'reds' buy and keep their 'paper' clean!