One Hump or Two Hump Master Cylinder

Im almost certain that the two hump was the factory installed style. The bail wire lids were primarily used on disc brake cars since the fluid needed to be added a lot faster than drum brake cars would due to the pistons moving out and the fluid taking up space. I seem to recall that there was some kind of reason behind why they made that different style lid but for the life of me I can't think of it now. Possibly something to do with manual vs power drum brakes?
 
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