Bottom of the page, bottom of the list of manuals.
MANL:PARTS:CUB LTX1042/45:2012
MANL:PARTS:CUB LTX1042/45:2014
Looks like 2012/2013 and then 2014 and later are two different parts manuals. The spring could be the same on both.
Maybe something like this part 12? (Cable, Engag, Deck)

If so, they are indeed different based on mfg date. 946-04618A or 946-04618C
A search for 946-04618 - without the A or C gives back this - https://www.cubcadet.com/en_US/prior-year-models/ltx1042-kw-cub-cadet-riding-lawn-mower/13WG93AS210.html
One result and it's 946-04618C with the C. My best guess if the updated/improved version. Who knows what happened to plan B?
A search for 946-04618A gives the same result.

I'd like to solve the puzzle Pat. The answer is; What You Need.
You can get it from Cub Cadet or elsewhere - https://duckduckgo.com/?q=946-04618C+cub+cadet+spring
Hmmm, it looks like the spring only comes as part of the 946-04618C engagement cable, for $42.26. That’s it (the broken spring), lower center of their picture of the assembly. So instead of just buying a $10 spring ya’ gotta buy the entire assembly. Crap. Especially because there’s no real reason to design it this way, except to make money on replacement parts.
Anyway, now I know what I’m up against! (Mainly, coming up with the bucks.) My Dad had two other CC mowers (presently inoperable), but they are different models and likely the assembly is somewhat different in every model... I may try to research them anyway.
Thanks much!!
I don’t have any diagrams, and some of the duct tape I’m using isn’t sticking properly, but I hung solar lights in my greenhouse and it looks SO COOL! So, there! ;)