Oh I have seen them but if you order them from Uncle's Tito's brother's cousin on FB or Corotos - likely you will send your money and get Bubkis and if it isn't a tienda you have no recourse or guarantee.If I'm not mistaken, the quick release caps can be used on other batteries as well.
Jump on FB marketplace and search for Trojan and you'll see dozens of ads for them.
Ask those sellers where you can visit their store, ....then crickets