Hundred and thousand light industrial series. I have made detail drawing with measurements available for free to members of this site. you can look it up in the ford section.
I was contacted by Phil,RedRock, and I spend him my original so he can produce them. I will be putting a set on my newly acquired 871 gold demo. I had a set on my 671,841 and 4000 series. They work great on the SOS. Soundguy has a set on one of his tractors as well as other people on this forum.
I have not made one for the N tractor. Even though I still have a half dozen or so of them I don't use them as much as I do the hundred and early thousand series.
It will not interfear with the hand throttle. you can use either or.