I dont think the source of the original IRS is known.
I might suggest you have this fine gentleman contact the people currently restring the Green Hornet.
I am very suspect, until he comes around with a lot more information.
Pete, I totally understand, and I'm very suspect too. But it is interesting to pursue this. I've already learned so much more about the EXP than I ever knew before. Thanks!
The "big deal" with the original is the "hub assembly". It was done at a time when except for the Corvette, no US manufacturers would do anything with an American IRS.
The source would almost have to come out of a European car to simplify and expedite things but it sure could have been milled out of alloy billet.
Certainly Miles wouldn't have patience for that and probably would have got a Jag rear out of a local junk yard and fit it into one of his "coupes".
Sometimes I hear that was a Falcon. Sometimes a Mustang. Now someone suggested it was in one of the mechanics Rancheros?
Maybe it belonged to one of the strippers at one of the strip joints down the road?
The suspension arms are just made up of DOM (drawn over mandrel) steel tube like is used on motorcyle frames welded to bushing sockets. Probably 3/16" thick wall. That's what I use but other wall thicknesses are readily available from steel suppliers.
It isn't any mystery.
Besides that, the hard part from the engineering standpoint was getting the lengths of them to work with the "stock mounting locations" that they wanted to use. That's where Claus Arnig came in with the "Ford computer".
That thing must have been amazing to watch work with all of the IBM punch cards they had to use to make it work?
I don't think anyone has identified the hub assembly itself such as coming from Jaguar, etc., but I may be wrong on that. Ask Dwayne. It's like he dedicated his life to reproducing the thing accurately.
The rap against the IRS was that several shops built and tried them including Mark Donahue and Roger Penske when they were running the Camaro. Virtually EVERYONE said it was a waste of time since the cars weren't even a second a lap faster around a track.
As far as the "Green Hornet" restoration shop taking stamped steel control arms off of an IRS T-bird or even a current production vehicles is a terrible idea.
That stuff is so thin and cheaply made you are risking life and limb. The arms twist and bend like pretzels. They are really garbage and to put any kind of a high power drive line through them is dumber then the manufacturers are, which is pretty dumb.
The original Fred Goodell design most likely resembled Carling's reproduced design. The concept is certainly the same and the pick up points depend on the Mustang chassis, and those didn't vary.
No stamped steel arms in that. All DOM thick wall steel tubing.
The cool thing with that "original Ford design" were the pin drive knock off wheels that were designed for it BUT so far, I haven't seen any of those wheels on a retro fitted car. Not yet.