Your question is a bit loaded, I'm sure not intentionally.
Are you planning to use a Cub Cadet tiller that was intended for the 169, or are you going to use a sleeve hitch type tiller with a separate motor on it, like the ones from Agri-Fab and Brinly-Hardy? Below are pics of a tow behind type tiller from Agri Fab.
The Cub Cadet tractors did not have a "standard" 3-point hitch like is on larger tractors, where the arms lift the implements. The standard hitch for a Cub Cadet is either the drawbar (which you have) or a Sleeve Hitch. On a Cub Cadet sleeve hitch, the rear rockshaft (top link) is the part that lifts the implement, and the implement pivots on the bottom attachment points.
Here is a photo of my Cub Cadet 124 and the rear sleeve hitch:
And here is another photo (pre restoration) showing the sleeve hitch with a Brinly adaptor installed. This adaptor lets you use Agri Fab and Brinly Hardy implements like plows, cultivators, tillers, disk, etc.
To use a Cub Cadet tiller, you need the sleeve hitch rear rockshaft (top link) and an adaptor angle drive which transfers the PTO power by way of a long drive belt from the front PTO pulley (same as your mower PTO pulley), runs all the way under the belly of the tractor, to the rear angle drive for the tiller. From there a short belt runs from the angle drive up to the drive pulley on the tiller. Below is a picture of my 149, setup for the tiller. When mounting the tiller, you must remove the triangle standard drawbar part.
And below is a picture of a Cub Cadet Tiller. Sorry, I do not have any pictures of it mounted, but you should be able to get the idea.
Now, there are a couple of folks that are making really nice Category 0, 3-point hitch setups for 149/169 Cub Cadet tractors, which will allow you to use standard Cat-0, 3-point equipment. However, they are pricey, around $500 for the hitch kit, and you still cannot run a tiller because the Cub Cadet tractors do not have a 540 RPM rear PTO as in a larger tractor. http://www.xtrememotorworks.com/Parts%2 ... List.htm#3
So, as you can see, you need to decide a little more on what you plan to do.
Let us know if you have any other questions.