in your pic of the lid, you have a ford dual master, not a single you can see by the rubber pad under the lid, looks to me like two jars to hold fluid just like a ford, they make them for ford masters and GM
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By "bail", I mean the wire snaps that hold the lid in place.
Mine is a single bail and from what I've seen, the only ones available for the Ford masters are double bail :(
The double bail masters have a different reservoir design (round on both sides)
My master is round on one side and square on the other :o
Here's a pic from Speedway that is identical to what I have....
http://www.fuelslut.net/ihost/files/...dmasterpic.jpg
That resembles the master cylinder that on a 75 Duster I once owned.