I have tried the Trident rivet style seat in a balanced adjustable and it works fine. I have never tried the HOG seat but it is fairly obvious that all the balanced barrel poppet designs seem to now use the same rivet style replaceable seat. If in doubt, give it a try and if the shoe fits....
I lost my source of kits. I did manage to get a small stock of various seats and other parts to go with my stock of o-rings. These rivet style seat seem to last quite a few years. My wife's Mk20/S600, which is all she dives, goes 5 years or more on a new LP seat. If you are really in a bind, I can probably spare a seat but I am in the mode now of expecting my parts stock to last the rest of my diving life. But I still keep an eye on ebay for deals I just can't pass up.