Yessssss I did. Plus all the other local chain parts stores.
Plus I thought I had some mad google skills, and I still can't find a parts house that sells 12" brake drum parts. Shoes, yes. Wheel cylinders, yes. Springs seem to be interchangeable from 11" to 12", so I have all new parts except for this stupid adjuster arm.
Heck Inline Tube is putting a copy of my E-brake cable into their catalog now after being able to copy mine, since the one they were selling for a 67-72 was for an 11" brake drum.