The Cole planter is pretty much horsedrawn technology, they have been making these things since the earth was cooling.....when my dad started farming in the 1960's that was the first new planter he had, two Cole's mounted on a three point hitch IH cultivator with a 2-point fast hitch adapter so he could pull it with the 230. To give you an idea of how "good" an outfit it was, as soon as he could he bought a USED JD planter to replace it. (It was a JD 25B IIRC.)
Fertilizer attachments for the 71 and 185 were both separate units......both of these planters were made to be put on a toolbar, so that you could make it as many rows and as many row spacings as you wanted, limited by the length of the toolbar. YOu then had a hopper(s), fertilizer openers, drive system, etc. that mounted separately to the toolbar if you wanted to add fertilizer. The nice thing about a Cub is, if you have the fertilizer attachment for the 144 cultivator, you could apply fertilizer that way, and have the planter on the back.
I am 99% sure you could get a 185 with a factory fast hitch prong. IT would not be hard at all to adapt the 71 to the Cub, with either fast hitch or standard hitch.
What I'd really kinda like to try is to put one of these planters under the belly, on the 144 cultivator. I am sure it would be easier to come up with a hitch for the rear, but I'd still like to try it.