Identification of old Sportsways regulator and where to find a diaphragm for it

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Another reg. that has a similar 2nd stage is the Z90 not sure if they still trading or this is a retail out tag. Z90   1.JPGZ 90.jpg
 
Thanks for all answers!
Seems it will be difficult to find a match.
What are the diameters commonly available out there?
Worst case I'll make an adaptor for a smaller diaphragm.

Original diameter is 74 mm. What is that in imperial?

---------- Post added at 09:01 PM ---------- Previous post was at 08:50 PM ----------

Oh ****, just found a 75 mm diaphragm on ebay!
Will order right away and se if it fits.
 
If any one is in a need for a copy of the Sportsways parts list and repair manual. .i could get you a copy . just the cost of printing it and shipping it.Has 71 pages or so covers water lung 100, water lung 200 , sport diver regulator II , hydronaut II , navy unit III , atm 1000 , atm750 ,atm 500 , sport diver regulator III, hydronaut III , navy unit IV , AND SOME OTHER SPORTSWAYS equipment. if intorested give me a PM
 
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Update:
Got the 75 mm diaphragm and it fits *almost* perfectly. Only trouble is the rim which was too thick to allow both the "push rubber thingy" and the plastic cover to fit with the metal retainer.
Shaved off ~1 mm with a knife and now everything is in place and working nicely.

Suprised at how easy it is to breathe from! A lot less resistance than my primary Scubapro R295 even though the age difference is probably ~30 years.
Guess things haven't evolved quite as much as many of my fellow divers and diveshops would have me believe ("That old junk is unsafe to dive with!").
 
My friend Jerry tells me he has many parts for your reg. He is having trouble getting on the site. Send me a PM and I will put you in touch with him.
 
https://www.shearwater.com/products/swift/

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