Going to a 2 wire field alternator

or you can buy an electronic version of the black one with only two connections as well

i have never had a problem with this type
Reproduction Solid State Electronic Correct Restoration Appearance Voltage Regulator - Down to Earth Auto Electrics
you can see the nicly soldered board in the second picture obviously they have a cover in real life he is just showing whats inside.. i.e modern

and if this guy in the UK is selling them he will have got them from the USA, that costs so he will have done his research nobody wants a shelf full of crap they can't sell when they are a one man business.

Dave