Ah yes... Well, according to the recent package that came in the mail from
Acton Custom Enterprises today (I'm referring to the very well made reproduction Cobra 427 Chassis Instruction Book), I can speak with confidence when I tell you that the original fans were as follows:
"From chassis CSX.2167 inclusive, a Lucas electric cooling motor is
fitted, Model 3GM with large cooling blades, located ahead of radiator.
The radiator cooling fan is fully automatic and is controlled by a
thermostat switch located in the casting integral with the bottom radiator hose. No manual switch is provided.
427 Cobras are fitted with single or dual electric fans mounted behind
the radiator. Type PES.2379/4. Smiths."
I'm loving all the interesting facts within this book. Too bad it doesn't offer a good location to find the fan motors! In the absence of a time machine, just paint your fan motors gloss black and enjoy your "Smiths" fan motors!