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Edit:
It's found a new owner. Please accept my apologies for the late notice, I had a heart attack and open heart surgery shortly after posting, and I just got my act together enough to post this up. Next one I find will go the same way as this one.
I found one during my safari to my favorite honey hole. I's intact, but the lid has a crack near the hinge, see the pics.
I paid $10, and I'll need shipping. I'll box it up nice and safe for you.
My old 1980 had one. The washer/overflow mounted behind it. I am guessing it wasn't available if you had a diesel or aux battery with two batteries. The box is about the same size as a battery, I bet they move the washer/overflow reservoir into the same position for a dual battery truck.