There is a possible point of confusion here. IH may have sold them as 2 different models for a while. They were certainly sold as a single model (Cub-L38), essentially as a unit with no hitch that required a separate "completing package" to attach it to the tractor. There were at least 3 completing packages:
- Fast Hitch for the Farmall Cub
- Fast Hitch for the Cub Lo-Boy
- Standard drawbar for Farmall Cub without Fast Hitch.
There was also a Model 38 for the 100/140 tractors with Fast Hitch. It was a different machine, yet similar in appearance.