[5 Cub Cadets]

There is probably, somewhere on this site of "Mega-Cub Cadet- Information" an answer , but for the life of me I don't know, where I should be looking?
I am looking for the mower drive belt size, for a Cub Cadet 122 ( don't know where I put it, after taking it off--Don't get old , it happens more frequently, now!) ?
Any help, direction--appreciated.
Thanks,
Dick