Hi and welcome. If the Toptank glass is not the same as the ST, I don't have any idea where to get it. Prefab coils that use TC wire will say so on the coil base where the ohms are engraved. There'll be Ni or Ti or SS or something there by the ohms number. If nothing appears, it's a wattage coil. I have been building my own coils for years, and wouldn't have it any other way. You are using a regulated mod, and it's supposed to watch out for things like that so it doesn't blow up. Coil building can be done safely, and there's no better place to learn how than here, plus some videos. I strongly recommend the use of a stand alone ohmmeter. That way you can test for a short before you put it on the mod and take no risk of firing a bad one.