In my experience one of the greatest weaknesses of those Hakko clone soldering stations (outside of what a perfectionist wants, I mean to just use it to solder) is they use low quality wand wire that is prone to internal breaks.
For this reason I would buy the entire wand, to get new wire as well as the heating element in it, considering they are about $8 delivered on ebay.
However for a couple dollars less you can get just the heating element, also in the search results from this link which is "supposed" to be for only US sellers (but look at the estimated shipping/arrival date in case a listing has a shady origin as US but isn't really):
https://www.ebay.com/sch/i.html?_from=R40&_nkw=A1322+soldering+iron&_sacat=0&rt=nc&LH_PrefLoc=1