Yup that's it. Some sellers have a bad habit of listing every single MJX model in the description, so you have to be careful which parts they are selling, as it may be for something totally different.
Found this out when looking to buy my F45 from Aliexpress. I wondered why of all the F45s, one was only $50 vs the $100+ of the others. Turned out it was a F29, which is the size of a SoloPro 260, or V911 and is Coax