55.2-59 Steering Arms ball stud taper different on 3100 vs 3600 55-59

[Hcb3200]

In my research I have come across this image at one of the vendor sites. It’s the only one I’ve seen with that metal rubber grommet boot upper left corner that goes on the tie rod end I’m assuming it’s something they have custom created for their tie rod ends because I’ve never seen that on any other site. Is that a old part they’ve resurrected or is that modern updates to an old tie rod end