For those of you with rear drums still, I found a 1 1/8" master cylinder that I'm going to try. It is from Classic Performance Products. It is a "Corvette Style" with the same size fittings and bore (front and rear switched) and it is aluminum. It is a few bucks more than the parts store replacements, but considering it is aluminum and your fluid won't turn into a rusty brown goo mix of fluid, rust flakes, and water; it is probably worth it. $65.00 plus shipping
Classic Performance Parts M-C118-APBLF

Classic Performance Parts M-C118-APBLF
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