Some picture links were downloadable and viewable, but the one where it is mentioned about pictures that show old and new there were no links, I assume these have been deleted in the past?
As mentioned my preference for direct control of the fan speed, i.e.using a resistor to give me two speeds however, the controller you linked to appears to be purpose built, and I may follow that up as a sealed unit was mentioned.
The thread did confuse me a little so could do with some clarification of the correct fan and if possible some parts numbers?
I did note there were 400 and 600 watt motors mentioned and I have even seen 850 watt versions for sale, but the shroud on the 850 unit looked more 'square' and if I have the dimensions right too large to fit my radiator.
I am not averse to some swapping about, perhaps the 600 fan on the 850 motor?
I did see there was not a lot of activity on this particular thread of recent, so assume all is working fine.
Anyone who can chime in with any info would be appreciated.