You will need a single diaphragm for drum/drum applications.
There are some aftermarket ones being made, as well as the factory ones.
I am wanting to change mine out on my 1971 GMC because it is Disc/Drum, and the one I have is from a '69 GMC.
If you get one that is from a 67-70, it should just bolt up no problem. I don't think I went through much trouble at all to put that one on mine.
Where is Hawkinsville at? I am in Ringgold, about 8 miles south of Tennessee. If you were interested, we might be able to work something out.
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