That is cool about the battery decal. The 63 barn car I got out of Iowa had a decal there that was painted over. I took lots of time to try and remove the paint to see what the decal was but I just couldn’t get to a point I could see it. I never looked in the assembly manual. I don’t think that decal was on 62 cars.
I will get a picture of both washer tanks Sandy. Yours could be a 63 tank, I just never seen a 63 tank with Oldsmobile on it. The two tanks mounting hole locations are different.