1978 kz400b regulator replacement

I'm looking for a replacement for my regulator / rectifier parts number 21066-029. I've found lots of cheap $20 Chinese options but I don't imagine that these will last long. Anyone have a recommendation for a replacement from a trusted website? 
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According to Partzilla they still have them  www.partzilla.com/catalog/kawasaki/motor...1/ignition-regulator
It would appear the part was used on several different models  www.partzilla.com/product/kawasaki/21066...ae784f8bef65cc13a3c0

I have read good things about Rick’s, but have no personal experience with them.

ricksmotorsportelectrics.com/results/

Forum legend, Lew, recommended cheap EX500 R/R's.  Personally, I prefer a Shindengen SH775, which is SERIES type, and will protect your stator from overheat failure.  I can't see the value in buying a china R/R from an aftermarket source, when these better options exist.