I believe I have found the make/model of the fan in the back of the cockpit.
Rotron AX2HT-115-464YH
There are quite a few to be found on eBay but I purchased this one;
Rotron AX2HT-115-464YH
There are several variations of this fan;
The YH at the end indicates single phase AC. If you find one listed as JH, that's 3 phase AC, which is probably not what you want. It would seem odd for ILM to use 3 phase, but as there's no way to see the label for the fan, or any of the internal wires, I'm going to assume they kept it simple and used single phase. In any event, outwardly the fans are identical, so it wouldn't really matter which way you chose to go.
These fans are still in production because they are used in aircraft avionics. And as some avionic units were made in the 60s, replacement fans need to be identical to maintain the aviation type design and their air worthiness cert. (I'm an AME-S, it's my job to repair aircraft to their original type design)
Also, because these fans have an aviation cert, they can be very expensive. Try and find old ones that do not come with an aviation certification included. They would be about $70, rather than $400.
The attached PDF is the datasheet and drawing for newly manufactured ones. As aviation documentation needs to be kept current, the original drawings from the 60s/70s probably wouldn't qualify anymore.
These fans are 2.14" in diameter. There is another variation of this fan that is 3" in diameter, but based on limited photo evidence, I think the 2.14" fan is correct.
If someone has any corroborating or opposing information, please let me know. Otherwise I am going to say that this is the fan that was used. Hopefully this is new information and someone doesn't come out of the wood work and say 'well yeah, we all knew that...'
I still have no information on the engine deck fans.
Because my cockpit was designed to be modular, once my order arrives, I'll update it to use the correct fan in the back.
[edit] also, I need to shout out to
Dazza007, as it was his ChatGPT log that put me on to Rotron

