There are three likely candidates:
Macs (USA)
Mike Davidson (AUS)
and,
Dennis Carpenter (USA)
I bought ONE kit from Macs.Cost was $19.50? USD with a $59 dollar freight bill. Not happy
Other kit came from Mike in SA. $55 delivered. I am very happy as it is in a
Macs box..with a Mac's Part number!
Dennis Carpenter has reproduction pumps with a different blade angle for less cavitation and better flow. but $$$ was a lot.
Advice is use Mike. P.S. the MLU site is UP! for a change.
Ian