Ran into a bit of a glitch.
I was putting it on the HT20D, and found out that if it's going to work on an HT series tractor that I'm gong to have to have a piece fabbed up.
It mounts just like the LF tillers, but also has a tab at the top that attaches to the bracket that the top link for a 3-pt hitch attaches to.
However there seems to be enough difference between the early LFs and the HT LFs that it won't just 'drop in'.
I guess the other option is to put it on the 1886 that I have the FEL on.
Here are the pics so that you can see what I'm dealing with