I don't have the answer except that it got me thinking.....
.... eGo, vGo, t-rex, tornado, ovale, riva, ... all the same beast but sometimes made by a different manufacturer with slightly different specs. For example, I think one of them has a cone that pops on instead of screwing on. I suppose one of them could have a cone that has course
threads instead of fine threads. I wonder if you are needing a cone that's similar but not made by the company that you think it is...?