This is what I have here in front of me. I bought it from a homebrew supply store and I don't have the manufacturer name. I was going to just get these off Amazon to use instead of the plastic ferrule, but then I got to thinking about whether the angles of the contact surfaces would be the same/compatible (the cone angle where the seal is made). You think I'm good?
Heck, I might just try it and see what happens. It's my own home project and nothing pressing.