You didn't specify which type of Fine Offset clone you have. There are several types. At least 6 types I can think of that are totally different. So let us know your exact model. Doesn't have the be the Fine Offset model you give us....you can give us the re-branded manufacture's model you have from Tycon, Ecowitt, Misol, Froggit..etc. Don't just say WH series or even WH2000 series because that is too generic and could be different things.
But regardless which you have it may be cheaper (or the only option really) to replace the entire outdoor array. But if your station hardware is of a much older type then you might want to replace them both (whole new station hardware). The newer WS-2902A or WS-2000 or WS-1550 are a big improvement if you were still using anything prior to these new models. (I don't recommend the Falcon WS-8478 though). These things are so cheap that they are disposable when they break pretty much. Unless you just need a new wind vane or anemometer cups.
If you own parts like an ObserverIP it would be compatible with the WS-2902A and the WS-2000 so you can continue to use it if you also had a WeatherBridge or Meteobridge. Then you could get just the outdoor module for the WS-2902A (it's compatible with the ObserverIP) for around $54 plus tax + shipping (add the screen for the WS-2902A or WS-2000 later).
You can get replacement parts (entire parts not sensors) directly from Ambient Weather (but they do sell wind vanes and cups for example separately):
https://www.ambientweather.com/westrepabyam.htmlSome of the big improvements if you were to consider upgrading (if you had an older model) are; better wind direction detection and steadiness (less randomness), 360 steps for each degree - for more accuracy, better wind at lower speeds of less than 1 mph, more accurate rain gauge, better temperature and humidity sensor SHT30, comes with super capacitor instead of needing rechargeable batteries, plus it looks much nicer I think.