FX112047 top nut is the same as a standard mg zt and there are some available on eBay although they are actually different nuts on the bilstein strut, they are a nyloc nut with a fine pitch thread.
RNS100050 top washer is same as standard mg zt so maybe find some used ones from a breaker.
RNH100060 looks very similar to RNS100060 which is standard mg zt so maybe breakers again ?
RYH100140 same as standard zt so breakers again, or if you're stuck I'm sure I've got some used ones.