Since you grew up on a farm I'm sure that you are familiar with the 3-pt hitch.
The sleeve hitch could more properly be called a 1-pt hitch. Sleeve hitch implements are connected to the hitch with just one pin.
There is a sleeve hitch for the tube frames, but Bolens did not have a 3-pt for them.
Here's a pic of my Ohio Steel sleeve hitch, another pic with a Hang-H-Haul carrier mounted on it, and a pic of a cultivator so you can see the implement side better.
The large frames have a CAT 0 3-pt hitch available, but no sleeve hitch. However you can use sleeve hitch attachments with the 3-PT if you have an A-Frame with the sleeve hitch adapter on it.
Here's a pic of an A-Frame adapter on my HDT1000.
Bolens had 2 different 3-Pt hitchs for the large frames. One for the 1250-1886 tractors, and one for the HT series tractors. They also had 3-pt hitches for some of the later series like the Duratracs.