I sent Bob an email. They are actually for a customer’s axle that I built. He wanted a pair of those.
To all who inquired, I'll be going back down there in a day or two and will check on them at that time. Brian is first in line.
Will second that. An occasional "G" body finds it's way into the pick a parts here, but I've never seen aluminum drums on any of them. Am of belief it was a just a few years thing, then they went back to cast iron. Same thing happened with the Aluminum BOP core supports, and the aluminum Monte Carlo hoods and deck lids. A few years, and then back to steel.